diff --git a/runtime/doc/tags b/runtime/doc/tags
index f450288..b36843f 100644
--- a/runtime/doc/tags
+++ b/runtime/doc/tags
@@ -10434,6 +10434,7 @@
 termdebug-events	terminal.txt	/*termdebug-events*
 termdebug-example	terminal.txt	/*termdebug-example*
 termdebug-frames	terminal.txt	/*termdebug-frames*
+termdebug-mappings	terminal.txt	/*termdebug-mappings*
 termdebug-prompt	terminal.txt	/*termdebug-prompt*
 termdebug-starting	terminal.txt	/*termdebug-starting*
 termdebug-stepping	terminal.txt	/*termdebug-stepping*
diff --git a/runtime/doc/terminal.txt b/runtime/doc/terminal.txt
index 70cfd7f..f17221e 100644
--- a/runtime/doc/terminal.txt
+++ b/runtime/doc/terminal.txt
@@ -1,4 +1,4 @@
-*terminal.txt*	For Vim version 9.0.  Last change: 2023 Aug 23
+*terminal.txt*	For Vim version 9.0.  Last change: 2023 Nov 08
 
 
 		  VIM REFERENCE MANUAL	  by Bram Moolenaar
@@ -42,6 +42,7 @@
       Other commands				|termdebug-commands|
       Events					|termdebug-events|
       Prompt mode				|termdebug-prompt|
+      Mappings					|termdebug-mappings|
       Communication				|termdebug-communication|
       Customizing				|termdebug-customizing|
 
@@ -1461,18 +1462,22 @@
 If there is no g:termdebug_config you can use: >
 	let g:termdebug_use_prompt = 1
 <
-						*termdebug_map_K*
-The K key is normally mapped to |:Evaluate|. If you do not want this use: >
+Mappings ~
+					*termdebug_map_K* *termdebug-mappings*
+The K key is normally mapped to |:Evaluate| unless there already exists a
+buffer local mapping to K |map-local|.  If you do not want this use: >
 	let g:termdebug_config['map_K'] = 0
 If there is no g:termdebug_config you can use: >
 	let g:termdebug_map_K = 0
 <
 						*termdebug_map_minus*
-The - key is normally mapped to |:Down|. If you do not want this use: >
+The - key is normally mapped to |:Down| unless there already exists a buffer
+local mapping to the - key.  If you do not want this use: >
 	let g:termdebug_config['map_minus'] = 0
 <
 						*termdebug_map_plus*
-The + key is normally mapped to |:Up|. If you do not want this use: >
+The + key is normally mapped to |:Up| unless there already exists a buffer
+local mapping to the + key.  If you do not want this use: >
 	let g:termdebug_config['map_plus'] = 0
 <
 						*termdebug_disasm_window*
diff --git a/runtime/pack/dist/opt/termdebug/plugin/termdebug.vim b/runtime/pack/dist/opt/termdebug/plugin/termdebug.vim
index e6126ee..144d083 100644
--- a/runtime/pack/dist/opt/termdebug/plugin/termdebug.vim
+++ b/runtime/pack/dist/opt/termdebug/plugin/termdebug.vim
@@ -2,7 +2,7 @@
 "
 " Author: Bram Moolenaar
 " Copyright: Vim license applies, see ":help license"
-" Last Change: 2023 Aug 23
+" Last Change: 2023 Nov 02
 "
 " WORK IN PROGRESS - The basics works stable, more to come
 " Note: In general you need at least GDB 7.12 because this provides the
@@ -990,7 +990,9 @@
   endif
   if map
     let s:k_map_saved = maparg('K', 'n', 0, 1)
-    nnoremap K :Evaluate<CR>
+    if !empty(s:k_map_saved) && !s:k_map_saved.buffer || empty(s:k_map_saved)
+      nnoremap K :Evaluate<CR>
+    endif
   endif
 
   let map = 1
@@ -999,7 +1001,9 @@
   endif
   if map
     let s:plus_map_saved = maparg('+', 'n', 0, 1)
-    nnoremap <expr> + $'<Cmd>{v:count1}Up<CR>'
+    if !empty(s:plus_map_saved) && !s:plus_map_saved.buffer || empty(s:plus_map_saved)
+      nnoremap <expr> + $'<Cmd>{v:count1}Up<CR>'
+    endif
   endif
 
   let map = 1
@@ -1008,7 +1012,9 @@
   endif
   if map
     let s:minus_map_saved = maparg('-', 'n', 0, 1)
-    nnoremap <expr> - $'<Cmd>{v:count1}Down<CR>'
+    if !empty(s:minus_map_saved) && !s:minus_map_saved.buffer || empty(s:minus_map_saved)
+      nnoremap <expr> - $'<Cmd>{v:count1}Down<CR>'
+    endif
   endif
 
 
@@ -1080,26 +1086,29 @@
   delcommand Winbar
 
   if exists('s:k_map_saved')
-    if empty(s:k_map_saved)
+    if !empty(s:k_map_saved) && !s:k_map_saved.buffer
       nunmap K
-    else
       call mapset(s:k_map_saved)
+    elseif empty(s:k_map_saved)
+      nunmap K
     endif
     unlet s:k_map_saved
   endif
   if exists('s:plus_map_saved')
-    if empty(s:plus_map_saved)
+    if !empty(s:plus_map_saved) && !s:plus_map_saved.buffer
       nunmap +
-    else
       call mapset(s:plus_map_saved)
+    elseif empty(s:plus_map_saved)
+      nunmap +
     endif
     unlet s:plus_map_saved
   endif
   if exists('s:minus_map_saved')
-    if empty(s:minus_map_saved)
+    if !empty(s:minus_map_saved) && !s:minus_map_saved.buffer
       nunmap -
-    else
       call mapset(s:minus_map_saved)
+    elseif empty(s:minus_map_saved)
+      nunmap -
     endif
     unlet s:minus_map_saved
   endif
@@ -1774,3 +1783,5 @@
 
 let &cpo = s:keepcpo
 unlet s:keepcpo
+
+" vim: sw=2 sts=2 et
diff --git a/src/testdir/test_termdebug.vim b/src/testdir/test_termdebug.vim
index eba2a61..23ec0e8 100644
--- a/src/testdir/test_termdebug.vim
+++ b/src/testdir/test_termdebug.vim
@@ -83,10 +83,83 @@
   wincmd t
   quit!
   redraw!
+  call WaitForAssert({-> assert_equal(1, winnr('$'))})
   call assert_equal([], sign_getplaced('', #{group: 'TermDebug'})[0].signs)
 
   call delete('XTD_basic')
   %bw!
 endfunc
 
+func Test_termdebug_mapping()
+  %bw!
+  call assert_equal(maparg('K', 'n', 0, 1)->empty(), 1)
+  call assert_equal(maparg('-', 'n', 0, 1)->empty(), 1)
+  call assert_equal(maparg('+', 'n', 0, 1)->empty(), 1)
+  Termdebug
+  call WaitForAssert({-> assert_equal(3, winnr('$'))})
+  wincmd b
+  call assert_equal(maparg('K', 'n', 0, 1)->empty(), 0)
+  call assert_equal(maparg('-', 'n', 0, 1)->empty(), 0)
+  call assert_equal(maparg('+', 'n', 0, 1)->empty(), 0)
+  call assert_equal(maparg('K', 'n', 0, 1).buffer, 0)
+  call assert_equal(maparg('-', 'n', 0, 1).buffer, 0)
+  call assert_equal(maparg('+', 'n', 0, 1).buffer, 0)
+  call assert_equal(maparg('K', 'n', 0, 1).rhs, ':Evaluate<CR>')
+  wincmd t
+  quit!
+  redraw!
+  call WaitForAssert({-> assert_equal(1, winnr('$'))})
+  call assert_equal(maparg('K', 'n', 0, 1)->empty(), 1)
+  call assert_equal(maparg('-', 'n', 0, 1)->empty(), 1)
+  call assert_equal(maparg('+', 'n', 0, 1)->empty(), 1)
+
+  %bw!
+  nnoremap K :echom "K"<cr>
+  nnoremap - :echom "-"<cr>
+  nnoremap + :echom "+"<cr>
+  Termdebug
+  call WaitForAssert({-> assert_equal(3, winnr('$'))})
+  wincmd b
+  call assert_equal(maparg('K', 'n', 0, 1)->empty(), 0)
+  call assert_equal(maparg('-', 'n', 0, 1)->empty(), 0)
+  call assert_equal(maparg('+', 'n', 0, 1)->empty(), 0)
+  call assert_equal(maparg('K', 'n', 0, 1).buffer, 0)
+  call assert_equal(maparg('-', 'n', 0, 1).buffer, 0)
+  call assert_equal(maparg('+', 'n', 0, 1).buffer, 0)
+  call assert_equal(maparg('K', 'n', 0, 1).rhs, ':Evaluate<CR>')
+  wincmd t
+  quit!
+  redraw!
+  call WaitForAssert({-> assert_equal(1, winnr('$'))})
+  call assert_equal(maparg('K', 'n', 0, 1)->empty(), 0)
+  call assert_equal(maparg('-', 'n', 0, 1)->empty(), 0)
+  call assert_equal(maparg('+', 'n', 0, 1)->empty(), 0)
+  call assert_equal(maparg('K', 'n', 0, 1).buffer, 0)
+  call assert_equal(maparg('-', 'n', 0, 1).buffer, 0)
+  call assert_equal(maparg('+', 'n', 0, 1).buffer, 0)
+  call assert_equal(maparg('K', 'n', 0, 1).rhs, ':echom "K"<cr>')
+
+  %bw!
+  nnoremap <buffer> K :echom "bK"<cr>
+  nnoremap <buffer> - :echom "b-"<cr>
+  nnoremap <buffer> + :echom "b+"<cr>
+  Termdebug
+  call WaitForAssert({-> assert_equal(3, winnr('$'))})
+  wincmd b
+  call assert_equal(maparg('K', 'n', 0, 1).buffer, 1)
+  call assert_equal(maparg('-', 'n', 0, 1).buffer, 1)
+  call assert_equal(maparg('+', 'n', 0, 1).buffer, 1)
+  call assert_equal(maparg('K', 'n', 0, 1).rhs, ':echom "bK"<cr>')
+  wincmd t
+  quit!
+  redraw!
+  call WaitForAssert({-> assert_equal(1, winnr('$'))})
+  call assert_equal(maparg('K', 'n', 0, 1).buffer, 1)
+  call assert_equal(maparg('-', 'n', 0, 1).buffer, 1)
+  call assert_equal(maparg('+', 'n', 0, 1).buffer, 1)
+  call assert_equal(maparg('K', 'n', 0, 1).rhs, ':echom "bK"<cr>')
+
+  %bw!
+endfunc
+
 " vim: shiftwidth=2 sts=2 expandtab