fight off
1．defeat in a fight；repel击退
He fought off three men who attacked him．他打退了3个袭击他的人。
Our troops have fought the invaders off．我们的部队已击退了侵略者。
The boat's crew fought off the attack of the octopus．船上水手们击退了大章鱼的袭击。
2． drive away with effort赶走；努力摆脱；驱除
Although the girl tried to fight him off，in the end she was caught by him．虽然这女孩努力摆脱他，但最后还是让他抓住了。
She fought off her drowsiness and went on with her reading．她尽力驱赶睡意，继续读书。
We can fight off a cold by taking aspirin．我们可以服用阿斯匹林来治疗感冒。