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break off

part of speech: phrase
definition 1: to terminate or discontinue (something previously binding).
Out of fear, she broke off her engagement.The nation broke off diplomatic ties with its neighbor.I finally broke off my habit of biting my fingernails.
definition 2: to suddenly stop speaking or making sound.
She was speaking but broke off when the two men entered the room.The noise broke off after a while, but then it suddenly started up again.
definition 3: to remove (something) by breaking and pulling it away, usually with the hands.
She broke off a piece of the bread and dunked it in her soup.
definition 4: to become separated from a larger thing by breaking away.
Oh, no! A bit of my tooth broke off!