動詞 act up:

1. misbehave badly; act in a silly or improper way
   同義詞：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.
   引擎開始失靈，他心想非要跳傘降落不可。
2. Continually heavy rain made some rivers act up.
   連續(xù)不斷的大雨造成一些河流泛濫。
3. The car acted up because the spark plugs were dirty.
   汽車出毛病是因為火花塞臟了。
4. The car's acting up again.
   這輛汽車又出毛病了。