act up片語動詞KK [ækt ʌp] /ækt ʌp/發音片語動詞1調皮、搗蛋、不守規矩多指小孩The kids always act up when their grandmother visits.奶奶來的時候,孩子們總是特別調皮。2出毛病、運轉不正常My laptop has been acting up since the last update.自從上次更新後,我的筆記型電腦就一直出毛病。3發作、又犯了指舊傷或老毛病My knee acts up whenever the weather turns cold.每次天氣一變冷,我的膝蓋就會犯疼。