Meaning of “flake out” in the English Dictionary

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"flake out" in British English

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flake out

informal
phrasal verb with flake uk /fleɪk/ us /fleɪk/ verb [ I ]

UK to suddenly go to sleep or feel weak because you are extremely tired:

I got home and flaked out on the sofa.

US to do something strange or not do what you are expected to do :

I'm tired of relying on other people - they keep flaking out on me.

(Definition of “flake out” from the Cambridge Advanced Learner’s Dictionary & Thesaurus © Cambridge University Press)