0 to become silent suddenly, usually because you are embarrassed or nervous, or do not want to talk about a particular subject:
1 to refuse to talk or answer:
He just clammed up when I walked in.
中文繁体
（通常指因為尷尬、緊張或不願談論某一話題而突然）沉默不語，閉口不言，拒不開口…
More中文简体
（通常指因为尴尬、紧张或不愿谈论某一话题而突然）沉默不语，闭口不言，拒不开口…
MorePortuguês
fechar o bico…
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zaniemówić…
MoreTürk dili
utandığı veya sinirli olduğu için içine kapanmak, suspus olmak…
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терять дар речи…
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