Synonyms of 'flake out'
collapseDictionary, faint, pass out
If he flakes out, cover him with a blanket.
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If you collapse, you suddenly faint or fall down because you are very ill or weak.
It's common to see people in the streets collapsing from hunger.
If you faint, you lose consciousness for a short time, especially because you are hungry, or because of pain, heat, or shock.
I thought he'd faint when I kissed him.
Thesaurus for flake out from the Collins English Thesaurus
If you flake out , you collapse, go to sleep , or totally relax because you are very tired .