ward someone/something off
phrasal verb with ward verb uk/wɔːd/ us/wɔːrd/
避开;阻止;挡住
to prevent someone or something unpleasant from harming or coming close to you
In the winter I take vitamin C to ward off colds. 冬天我服用维生素C以预防感冒。
She was given a magic charm to ward off evil spirits. 她得到了一个魔法护身符，可以驱鬼避邪。