他主动认错了。
He admitted his mistake on his own.
to admit an error; to acknowledge one's mistake
Every character draws itself, stroke by stroke. Then grab the brush: trace it yourself and hear the word when you finish.
Nice writing!
Chinese words snap together like bricks. Every word below shares a character with this one, so you are already halfway to knowing it.
他主动认错了。
He admitted his mistake on his own.
他认错态度很好。
His attitude in admitting fault is good.