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I was trying to bind (C-M-x) to er/expand-region but I checked the key combination with (C-h k) and noticed that it was binded to eval-defun. So I tried to unbind it with any of the following commands:

(global-set-key (kbd "C-M-x") nil)
(global-unset-key (kbd "C-M-x"))

But even using any of those won't unbind the key and (C-M-x) still will be running eval-defun

This is the result after running both commands:

Won't unbind the key

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    note that you don't need to unset a keybinding before applying a new binding. As long as you set your new keybinding in the appropriate keymap, you can leave any other bindings as they are
    – Tyler
    Aug 8 '21 at 17:56
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    I think this question is a duplicate, but I don't have the time now to search for it.
    – Drew
    Aug 8 '21 at 18:35
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eval-defun is bound to C-M-x in lisp-interaction-mode-map while global-set-key and friends operate on global-map which has lower priority than any local key-map.

One way to bind C-M-x unconditionally is to use the bind-key package which provides bind-key* for this purpose:

(bind-key* "C-M-x" 'er/expand-region)
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  • Looking at the customoze menu I was surprised that (it seems so) I cannot change the key bindings there.
    – U. Windl
    Aug 9 '21 at 7:05

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