Relenting

To become less severe or intense; to become less hard, harsh, or cruel; to soften in temper

"He had planned to ground his son for a month, but relented and decided to give him a stern lecture instead."

To slacken; to abate.

"He will not relent in his effort to reclaim his victory."

To lessen, make less severe or intense.

(of substance) To become less rigid or hard; to soften; to yield, for example by dissolving or melting

The act of one who relents.