JMdict: 2844780

膝を打つ 【ひざをうつ】

  1. [exp,v5t] to express sudden recognition and being impressed; to slap one's knee
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Kanji in this word:

Kanji Meanings On Readings Kun Readings Grade
膝 Knee, Lap シツ ひざ
打 Strike, Hit, Knock, Pound, Dozen ダ, ダアス う.つ, う.ち-, ぶ.つ 3