- 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 car's engine began to act up.
- My cell phone's playing up again.
- Little children always act up with their parents at home.
- The boy is fond of acting up with him.
- The little fellow was cheeking up his mother again.