Moments passed before she noticed that not a single other person there had touched the flower and she understood her mistake.

When the student's answer is incorrect, the teacher helps the student to understand their mistake and to correct it.

Morgan asked, not ready to let up until he was sure Kelson understood his mistake.

Late, very late, they have begun to understand their mistake.

After that everyone understood their mistake and decided to fight together till the end.

The king understood his mistake and could not forgive himself.

They laughed when Kios made them understand their mistake.

She laughed at herself when she understood her mistake.

He could understand his mistake; but there was something that puzzled him.

When such persons are made to understand their mistake, some admit their error and rectify themselves.