みのしんぞう ノミの心臓 LinksSentence search for ノミの心臓Sentence search for のみのしんぞうSentence search for 蚤の心臓Kanji details for 心 and 臓Edit in JMdict Expressions (phrases, clauses, etc.), Noun1. timidity; cowardice; courage of a fleaIdiomatic expressionOther forms蚤の心臓 【のみのしんぞう】 Discussions Log in to talk about this word.