Meaning of 口火を切る in Japanese
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口火
を
切る
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Definition of 口火を切る
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(exp, v5r) to start the debate; to get the ball rolling; to fire the first shot (fig. only); to start a conversation
グループの人たち全員が沈黙しているときは、誰かが話の口火を切らねばならない。
When all the group members are silent, somebody must break the ice.