I. wimp 1 /wɪmp/ BrE AmE noun [countable] informal
[ Date: 1900-2000 ; Origin: Perhaps from whimper ]
1 . someone who has a weak character and is afraid to do something difficult or unpleasant:
Don’t be such a wimp!
2 . a man who is thin and physically weak
—wimpish, wimpy adjective
II. wimp 2 BrE AmE verb
wimp out phrasal verb spoken
to not do something that you intended to do, because you do not feel brave enough, strong enough etc SYN cop out