clam² v -mmed, -mming clam up phr v [I] informal to suddenly stop talking and refuse to say anything more 【非正式】 〔突然〕沉默不语: Tom always clams up if you ask him about his girlfriend. 如果问到他的女朋友，汤姆总是一声不吭。
clam up informal to suddenly stop talking and refuse to say anything more 【非正式】 〔突然〕沉默不语: Tom always clams up if you ask him about his girlfriend. 如果问到他的女朋友，汤姆总是一声不吭。