Etymology
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guarantor (n.)

"one who binds himself that the obligation of another shall be performed," 1811, from guarantee with Latinate agent noun suffix -or substituted for -ee.

updated on April 24, 2015

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Definitions of guarantor from WordNet

guarantor (n.)
one who provides a warrant or guarantee to another;
Synonyms: surety / warrantor / warranter
From wordnet.princeton.edu, not affiliated with etymonline.