Verb
wuss out (third-person singular simple present wusses out, present participle wussing out, simple past and past participle wussed out)
(intransitive, slang) To fail to do something because of cowardice.
He said he was going to climb that tree, but he wussed out at the last moment.
What you've got to do is be honest. Say what you believe. Give it to them straight. Just don't wuss out. Michael Bloomberg