give away

To make a gift of (something).

“I didn't like that book, so I gave it away.”

To relinquish control over.

To formally hand over a bride to the bridegroom; often by her father.

“Who giveth away this woman to this man in Holy matrimony?”

(sometimes reflexive) To unintentionally reveal a secret, divulge undisclosed information, or expose someone.

“He gave away his hiding place when he accidentally sneezed.”

To concede an advantage in weight, time, height etc.

“Despite giving away twenty pounds in weight, the challenger found a knock-out blow in the second round.”

To concede.