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へそが茶を沸かす;臍が茶を沸かす;へそが茶をわかす(sK);臍が茶をわかす(sK) [へそがちゃをわかす] /(exp) (1) (See へそで茶を沸かす・1) (id) what a joke!/don't make me laugh!/(exp,v5s) (2) (id) to split one's sides laughing/to be convulsed with laughter/one's navel boils water (using the heat generated by laughing)/EntL2830220/