wuss out
Upper Intermediate (B2) slang
To decide not to do something scary because you are too afraid — and people think you are being a coward.
"He was going to ask her to the dance but wussed out at the last second."
Hear it in context
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Ink Master · 13:25
I'm not in this competition to wuss out.
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Austin John Plays · 2:44
and anytime that we're applying a lot of pressure and they're going to wuss out,