To unintentionally reveal a secret, divulge undisclosed information, or expose someone.
To concede.
To formally hand over a bride to the bridegroom; often by her father.
To relinquish control over.
To concede an advantage in weight, time, height etc.
To make a gift of (something).
to reveal or indicate, especially unintentionally or against one's wishes
Used other than figuratively or idiomatically: see let, on.