abbrev-expand-function is a variable defined in abbrev.el.gz.

Value
abbrev--default-expand

Set

Documentation
Function that expand-abbrev uses to perform abbrev expansion.

Takes no arguments, and should return the abbrev symbol if expansion
took place.

View in manual

References
References in abbrev.el.gz:
(defvar abbrev-expand-function ...) 1 reference
(defun expand-abbrev ...)           1 reference

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Debugging
Forget

Source Code
;; Defined in /usr/share/emacs/29.4/lisp/abbrev.el.gz
(defvar abbrev-expand-function #'abbrev--default-expand
  "Function that `expand-abbrev' uses to perform abbrev expansion.
Takes no arguments, and should return the abbrev symbol if expansion
took place.")

Symbol Properties
variable-documentation
  ("abbrev.elc" . 29390)