noun

1. A solemn promise to do something.

2. A security to guarantee payment of a debt.

3. A person who has taken a pledge of allegiance to a college fraternity, but is not yet formally approved.

Synonyms: commitment, collateral

verb

1. To make a solemn promise (to do something).

2. To deposit something as a security; to pawn.

3. To give assurance of friendship by the act of drinking; to drink to one's health.