I'm hitting C-x C-t (transpose-lines) too often when I mean C-c C-t, so I'd like to set the former key binding to nil. I've made several attempts at the proper elisp, but to no avail. Could someone help me?

Hacked from other examples. 1. (define-key org-mode-map (kbd "C-x C-t") 'nil) 2. (define-key org-mode-map (kbd "C-x C-t") nil) 3. (add-hook 'org-mode-hook '(lambda () (define-key org-mode-map (kbd "C-x C-t") #'nil)) I'll definitely learn elisp, eventually, but I'd sure like to be sure that I don't unknowingly mess up my org file in the meantime!

Keys under `C-x` aren't defined by major modes. They are not mode local. They exist globally. Normal options are (define-key ctl-x-map (kbd "C-t") nil) (define-key global-map (kbd "C-x C-t") nil) (global-set-key (kbd "C-x C-t") nil) (global-unset-key (kbd "C-x C-t")) See here: - https://www.gnu.org/software/emacs/manual/html_node/elisp/Key-Binding-Commands.html - https://www.gnu.org/software/emacs/manual/html_node/elisp/Standard-Keymaps.html

I finally got something to work: (with-eval-after-load 'org (bind-key "C-x C-t" #'nil))

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Ahh thanks, that didn't occur to me (though it should have)! I finally got an elisp format that sets the same thing in org-mode: (with-eval-after-load 'org (bind-key "C-x C-t" #'nil)) I'm not sure if that's the best way to do it, but it seems to work. I think I might keep this setting as an org-mode only setting, because the problem only occurs when I'm attempting to use the org-mode function `C-c C-a`. So when I eventually get to editing something in another mode and run across the transpose-lines binding again, it'll still work! (And I'll probably remove it altogether when I stop making that mistake.)

Another candidate: `(define-key org-mode-map (kbd “C-x C-t”) #'undefined)`

To be clear, what you've written still changes the key binding globally, it just changes it after Org is loaded. I have not used the `bind-key` package, but you might be looking for something like the below: (with-eval-after-load 'org (bind-key "C-x C-t" #'ignore org-mode-map)) The difference with what I posted before is that `ignore` is a command that does nothing. Using `ignore` is not the same as unbinding a key in a keymap. For example, if you were to unbind a key in a mode's map, that key could still be bound to a command in the global map. This is the current situation, as Org mode does not bind a command to `C-x C-t`. Binding the key to `ignore` in the mode's map, which can override bindings in the global map with its own, effectively makes the key sequence do nothing for only that mode.