bawl (one's) eyes out
To sob or weep loudly, uncontrollably, and for a long period of time. After we broke up, I just lay on my bed and bawled my eyes out. How is Aunt Mary? Last I saw her, she was bawling her eyes out at the funeral. Luckily, my husband was home when I got the bad news, and he held me as I bawled my eyes out.
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