HSK 1
对不起
duìbuqǐ动
I'm sorry; excuse me; I beg your pardon; to let (sb) down; to disappoint
对不起，我今天来晚了。
Duìbuqǐ, wǒ jīntiān lái wǎn le.
I'm sorry I arrived late today.
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 1.