The Oxford Thesaurus An A-Z Dictionary of Synonyms - pledgen.

1) promise, oath, vow, word (of honour) , covenant, assurance, guaranty, guarantee, warrant, warranty: They have our solemn pledge that we will return within the hour. 2) bail, surety, collateral, security, deposit, earnest (money) , pawn, gage, bond, guaranty, guarantee: They wanted something besides my signature as a pledge for the money. 3) toast, tribute, cheer, health: They drank a pledge to the success of the voyage. --v. 4) swear, vow, promise, give one's word (of honour) , contract, undertake, agree, vouch, vouchsafe: I pledge allegiance to the nation. 5) deposit, pawn, mortgage, Archaic gage, Colloq US and Canadian hock: He pledged his gold watch to pay for her birthday present. 6) toast, drink (to) , drink (someone's) health: Drink to me only with thine eyes And I will pledge with mine.