pledge

Definitions:

To deposit in pawn or as security; to engage by promise; to drink health to.
- Nuttall's Standard dictionary of the English language. By Nuttall, P.Austin. Published 1914. (verb) (v.) (verb)
To give as security: to engage for by promise: to invite to drink by partaking of the cup first: to drink to the health of.
- The american dictionary of the english language. By Daniel Lyons. Published 1899. (verb) (v. t.) (verb transitive)
Something put in pawn as security; a security; a surety; a security given for the repayment of money or the prosecution of a suit; a drinking to the health of another.
- Nuttall's Standard dictionary of the English language. By Nuttall, P.Austin. Published 1914. (noun) (n.) (noun)
Anything placed as a security or guarantee; a pawn; a drinking of a health as an expression of good will or a promise; an agreement or promise to do or not to do something; a token of good will.
- The Winston Simplified Dictionary. By William Dodge Lewis, Edgar Arthur Singer. Published 1919. (noun) (n.) (noun)
A security: surety.
- The american dictionary of the english language. By Daniel Lyons. Published 1899. (noun) (n.) (noun)
To warrant; to deposit as security; to engage by promise or declaration; to drink to the health of another.
- Etymological and pronouncing dictionary of the English language. By Stormonth, James, Phelp, P. H. Published 1874. (verb) (v.) (verb)
Anything offered as security; solemn promise.
- The Clarendon dictionary. By William Hand Browne, Samuel Stehman Haldeman. Published 1894. (noun) (n.) (noun)
PLEDGER.
- The american dictionary of the english language. By Daniel Lyons. Published 1899. (noun) (n.) (noun)
To promise.
- Newage Dictionary DB (verb) (v. i.) (verb intransitive)
To give as security or guarantee; put in pawn; to bind by a promise; drink to the health of.
- The Winston Simplified Dictionary. By William Dodge Lewis, Edgar Arthur Singer. Published 1919. (verb) (v. t.) (verb transitive)
To give as security; engage by promise; drink to the health of.
- The Clarendon dictionary. By William Hand Browne, Samuel Stehman Haldeman. Published 1894. (verb) (v. t.) (verb transitive)
Anything deposited as security; surety; a promise solemnly given; in politics, profession of principles; a warrant given, as one's faith or word; a hostage; a drinking to the health of.
- Etymological and pronouncing dictionary of the English language. By Stormonth, James, Phelp, P. H. Published 1874. (noun) (n.) (noun)

Usage examples:

I gave another pledge d'Orvilliers.
- The Road to Frontenac by Samuel Merwin
Keep to your pledge then, John, and all will be well.
- The Lights and Shadows of Real Life by T.S. Arthur Edition: 10 Language: English
Ordinarily, when stocks are put up as collateral, one thinks of the money as being lent, and the stock merely as a pledge
- The Value of Money by Benjamin M. Anderson, Jr.