If we act out in class, we will be sent to the principal's office. 我們在班上鬧事會被送到校長室。
act up (idiom) 出狀況。
1.My youngest child acted up in restaurants often when she was 2 years old. 我最小的女兒兩歲時常在餐廳出狀況。
2.What if the North Koreans start acting up again? 如果北韓又開始出狀況，那該怎麼辦？
3.Now, on polluted days, his lungs act up. 現在，在空氣不好的日子，他的肺就出狀況。
4.He began acting up when he was 3 years old. He would refuse to go to bed and insist in having the tele-vision on all night. 他三歲的時候開始出狀況，不願上床，硬是要看整晚電視。
5.Clemens’ hamstring—the one that slowed him against Oakland and Seat-tle—started acting up in the fourth. But then it went away. “I was actually able to get a second wind,” Clemens said. 在對上奧克蘭和西雅圖兩隊時讓克里門斯行動變慢的腿筋在比賽第四局開始出狀況，不過沒多久就恢復正常，他說：「我真的能夠重整旗鼓」。
