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What is another word for guarantee?

What's another word for guarantee? | Here's a list of synonyms for guarantee.

Definition 1: a written assurance that some product or service will be provided or will meet certain specifications - [noun denoting communication]

Definition 1: an unconditional commitment that something will happen or that something is true - [noun denoting communication]

Definition 1: a collateral agreement to answer for the debt of another in case that person defaults - [noun denoting possession]

Definition 1: give surety or assume responsibility - [verb of communication]

Definition 1: promise to do or accomplish - [verb of communication]

Definition 1: stand behind and guarantee the quality, accuracy, or condition of - [verb of communication]

Definition 1: make certain of - [verb of communication]