clam up片語動詞KK [klæm ʌp] /klæm ʌp/發音片語動詞1閉口不言、不肯開口、三緘其口口語He clammed up as soon as the police asked about the money.警方一問到那筆錢,他就閉口不言。2語塞、說不出話口語She always clams up when she has to speak in front of strangers.每次要在陌生人面前講話,她就緊張得說不出話。