bite down
动词- To bite (something) very hard and usually for a purpose (like to hold it in one's mouth). · Biting down on my wallet, I had two hands free to open the door.
- To clench with one's teeth. · He bit down to force himself not to say anything.
- To repress or bite back an (emotion, impulse or reaction). · She bit down on the urge to strike the woman who had wronged her.
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