HSK 4
敲
qiāo动
to hit; to strike; to tap; to rap
进办公室以前请先敲门。
Jìn bàn gōng shì yǐ qián qǐng xiān qiāo mén.
Please knock before entering the office.
Say it
Hold the button, say it, then let go.
Other HSK words sharing a character
Also free:
New in the HSK 3.0 word list at level 4.