act up

动词 act up:

1. misbehave badly; act in a silly or improper way
   同义词：carry on
2. make itself felt as a recurring pain

1. The engine began to act up and he thought he would have to hit the silk.
   引擎开始失灵，他心想非要跳伞降落不可。
2. Continually heavy rain made some rivers act up.
   连续不断的大雨造成一些河流泛滥。
3. The car acted up because the spark plugs were dirty.
   汽车出毛病是因为火花塞脏了。
4. The car's acting up again.
   这辆汽车又出毛病了。