fight-off

基本解释

That reaction preserves critical cellular functions, helping the body to fight off age-related diseases.
该反应保留了细胞关键功能，并帮助机体抵抗年龄相关的疾病。
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Another blueberry benefit: like cranberries, they seem to fight off urinary-tract infections by preventing E. coli bacteria from adhering to the bladder wall.
蓝莓还有另一个好处：和越橘一样，它们似乎能防止大肠杆菌附着在膀胱壁上，从而防止尿道感染。
The survival of Blanche Lincoln after a run-off fight in the Democrats’ primary in Arkansas was one of the big surprises of the elections held in a dozen states on June 8th.
她在阿肯色州民主党初选的最终胜利，是6月8日举行选举的十几个州中最大的惊喜。

Ghana was forced to fight short-handed after seeing defender Daniel Addo sent off by the Belgian referee following what seemed like an innocuous tackle in the first half.

State University, San Bernardino police have shot and killed a student during a fight in an off-campus dorm.
FORBES: California State University, San Bernardino
Lisa and her daughter, Alyssa, were terrified watching the brutal and bloody fight as her unarmed husband and son-in-law tried to fight off the three young men in their 20s.
FORBES: Did Police Turn a Blind Eye to Attack on Native American Family in Nevada?
The surgery transplants a healthy thymus into the body, providing it with the ability to manufacture sufficient T-Cells to fight off infections.
FORBES: Indiana Medicaid Denies Life-Saving Transplant To Baby

If you fight off something, for example, an illness or an unpleasant feeling, you succeed in getting rid of it and in not letting it overcome you.
If you fight off someone who has attacked you, you fight with them, and succeed in making them go away or stop attacking you.