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3. cry heart out

cry heart out

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cry one's heart out

 and sing one's heart out; play one's heart out; sob one's heart out

Fig. 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.

See also: cry, heart, out

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.

See also: cry, heart, out