US: A party that guarantees the performance of another. The contract through which the guarantee is executed is called a surety bond.
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An arrangement whereby one party becomes answerable to a third party for the acts of a second party. Customarily an insurance company, the party in a suretyship arrangement who holds himself responsible to one person for the acts of another.
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Corporation or individual who guarantees the performance or faithfulness of another.
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MEDICAL, US: Individual who undertakes to fulfill the obligation of another.
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See: Bond.