くちびき 口火を切る Show inflections LinksSentence search for 口火を切るSentence search for くちびをきるKanji details for 口, 火 and 切Edit in JMdict Expressions (phrases, clauses, etc.), Godan verb with 'ru' ending1. to start the debate; to get the ball rolling; to fire the first shot; to start a conversationIdiomatic expression Discussions Log in to talk about this word.