beat off
US /biːt ɔːf/
UK /biːt ɔːf/
1.
to masturbate (vulgar slang)
:
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He was caught beating off in the bathroom.
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Some people use pornography to beat off.
2.
to repel an attack or an attacker
:
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The defenders managed to beat off the enemy assault.
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She used a stick to beat off the aggressive dog.