pledge
1. pledge \'plej\ n [ME, security, fr. MF plege, fr. LL plebium, fr. (assumed) LL pl]ebere to pledge 1a: a bailment of a chattel as security for a debt or other obligation with out involving transfer of title 1b: the chattel so delivered 1c: the contract incidental to such a bailment 2a: the state of being held as a security or guaranty 2b: something given as security for the performance of an act 3: a token, sign, or earnest of something else 4: a gage of battle 5: TOAST 6a: a binding promise or agreement to do or forbear 6b1: a promise to join a fraternity or secret society 6b2: a person who has so promised 2. pledge \ple-'je-\ \'plej-*r\ \'plej-*r, ple-'jo.(*)r\ vt 1: to make a pledge of; specif : to deposit in pledge or pawn 2: to drink the health of : TOAST 3: to bind by a pledge : PLIGHT 4: to promise the performance of by a pledge : UNDERTAKE - pledg.ee n
Webster's English Dictionary