About
HSK levels

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

    他把靴子磕一磕,把泥土弄掉。 Tā bǎ xuēzi kē yī kē, bǎ nítǔ nòngdiào.

    1. variant of 嗑[ke4]