- 表现不好; 行为不良; (机器)出毛病; 作弄; 开玩笑; (旧病)复发; 恶化
- misbehave badly; act in a silly or improper way;
"The children acted up when they were not bored"
- make itself felt as a recurring pain;
"My arthritis is acting up again"
- The engine began to act up and he thought he would have to hit the silk.
- Continually heavy rain made some rivers act up.
- The car acted up because the spark plugs were dirty.
- The car's acting up again.