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fmakunbound  name ⇒  name
pronounced ,ef ’mak e n,baund or pronounced ,ef ’m\=a k e n,baund
name—a function name.
Removes the function or macro definition, if any, of name in the global environment.
(defun add-some (x) (+ x 19)) ⇒  ADD-SOME
 (fboundp 'add-some) ⇒  true
 (flet ((add-some (x) (+ x 37)))
    (fmakunbound 'add-some)
    (add-some 1)) ⇒  38
 (fboundp 'add-some) ⇒  false
Should signal an error of type type-error if name is not a function name.
The consequences are undefined if name is a special operator.