minor-mode-overriding-map-alist is a variable defined in `C source code'.
Its value is

  • Automatically becomes buffer-local when set.
  • This variable may be risky if used as a file-local variable.

Alist of keymaps to use for minor modes, in current major mode.
This variable is an alist just like `minor-mode-map-alist', and it is
used the same way (and before `minor-mode-map-alist'); however,
it is provided for major modes to bind locally.