Definition of “go/fall to pieces” - English Dictionary

british dictionary

“go/fall to pieces” in British English

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go/fall to pieces

C2 If someone goes/falls to pieces, that person becomes unable to think clearly and control their emotions because of something unpleasant or difficult that they have experienced:

She just went (all) to pieces during finals.

If a relationship, organization, or system goes/falls to pieces, it fails:

Their marriage began to fall to pieces after only a few months.

(Definition of “go/fall to pieces” from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)