たたく
to tap, to hit
Knuckles on the door twice, then twice again when nobody comes. Ta-ta たた, ku く: the same two beats every time, and they are in the word itself: たたく.
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Emaki is not affiliated with, or endorsed by, Kaishi 1.5k or its authors. The word, reading and meaning come from the Kaishi 1.5k deck, used with their permission. The mnemonic, the note and the kanji breakdown are original work, published under CC BY-SA 4.0.