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Difference between Eat one’s head off and Eat someone’s head off

eat one’s head off—

1. said of an animal whose upkeep costs more than it will sell for:

  • That ox has been here all winter and ate his head off.

2. (coll.) eat excessively or gluttonously:

  • I am not weighing in today as I just got back from New York and ate my head off while I was there.

eat someone’s head off—(coll., also: bite someone’s head off) speak to smb. in a rude and angry manner; severely criticize a person:

  • I have the worst temper in the world and will eat your head off at the slightest thing.