keep mum
(idiomatic) To refrain from talking, especially to remain silent about something that may be sensitive or secret.
plural of retroreflection
plural of rough-legged buzzard
plural of crawlspace
行方不明の書類について尋ねられたとき、彼女は事態を悪化させる恐れがあるため、口をつぐむことにした。
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