膝を打つ

ひざをうつhizaoutsu

expression · godan verb

  1. to express sudden recognition and being impressed
  2. to slap one's knee

Kanji in this word

Study it in Yanamino

Data from JMdict, KANJIDIC2 (EDRDG), KanjiVG, CC-CEDICT and Make Me a Hanzi. Sources and licences