to tap; to knock (against sth hard); (esp.) to knock (mud from boots, ash from a pipe etc); (fandom slang) to be into (a character relationship, dynamic, or

Watch it being written

Every character draws itself, stroke by stroke. Then grab the brush: trace it yourself and hear the word when you finish.

See it in sentences

他磕破了皮。

He scraped his skin.

他磕了一个头。

He knocked his head once.