軽く（優しく）なにかをたたく時の音。
落ち込んだ友人の肩をたたく、だっこしている赤ん坊の背中をたたく、カバーを取り換えた枕をたたくなど。
A sound made by lightly (gently) tapping something.
A tap on the shoulder of a depressed friend, a tap on the back of a baby in one's arms, a tap on a pillow with a new cover, etc.
ポップコーンなど軽いものが弾ける音にも使われる。
Also used for the sound of light objects popping, such as popcorn.
