Etymology
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betroth (v.)

c. 1300, betrouthen, "to promise to marry (a woman)," from be-, here probably with a sense of "thoroughly," + Middle English treowðe "truth," from Old English treowðe "truth, a pledge" (see truth). From 1560s as "contract to give (a woman) in marriage to another, affiance." Related: Betrothed; betrothing.

updated on May 22, 2017

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Definitions of betroth from WordNet

betroth (v.)
give to in marriage;
Synonyms: engage / affiance / plight
Etymologies are not definitions. From wordnet.princeton.edu, not affiliated with etymonline.