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- cry heart out
cry heart out
cry one's heart out
and sing one's heart out; play one's heart out; sob one's heart outFig. to do something with vigor or intensity. She suffered such grief—alone and sobbing her heart out. The bird sang its little heart out each morning.
cry/sob your heart out
(informal) to cry a lot Poor little love, her cat died and she's been crying her heart out all afternoon.