defalias

defalias is a built-in function in `C source code'.

(defalias SYMBOL DEFINITION &optional DOCSTRING)

Set SYMBOL's function definition to DEFINITION.
Associates the function with the current load file, if any.
The optional third argument DOCSTRING specifies the documentation string
for SYMBOL; if it is omitted or nil, SYMBOL uses the documentation string
determined by DEFINITION.

Internally, this normally uses `fset', but if SYMBOL has a
`defalias-fset-function' property, the associated value is used instead.

The return value is undefined.