My bad! “我错了”
An admission of guilt for a minor mistake; an expression meaning my fault!
When I accidently knocked over my friend's bag of golf clubs, I quietly said my bad! and he laughed as we picked them up.
我不小心碰翻了朋友的高尔夫球袋,我平静地说:“我错了!”他一边笑,一边和我一起把球棍检起来。