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。