Idiom Definition:
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"to wimp out"
to not do something because of cowardice or lack of conviction
Synonyms:
abandon, accede, acquiesce, balk, cancel, cave, chicken, coward, cowardice, demur, fear, fearfulness, give, gutless, recant, recoil, renege, resign, retreat, submit, surrender, timid, withdraw, yellow, yield
The little girl is refusing to cross the swinging bridge because she is too afraid. She is
wimping out.