Don't stand for fib (3)
I believe the answer is:
lie
I believe this is a double definition.
'don't stand' is the first definition.
'for fib' is the second definition.
(a fib is a lie)
(Other definitions for lie that I've seen before include "Tell porkies" , "Recline - untruth" , "A white one is considered harmless" , "Be prostrate" , "Prevarication" .)