What does "guarantee" mean?

Guarantee: One who binds himself to see an undertaking of another performed; a guarantor. South. Note: Guarantor is the correct form in this sense.

Additional senses

  1. 2.(Law) The person to whom a guaranty is made; -- the correlative of guarantor. A guarantee is an engagement that a certain act will be done or not done in future. A warranty is an engagement as to the qualities or title of a thing at the time of the engagement.
  2. 3.In law and common usage: to undertake or engage for the payment of (a debt) or the performance of (a duty) by another person; to undertake to secure (a possession, right, claim, etc.) to another against a specified contingency, or at all avents; to give a guarantee concerning; to engage, assure, or secure as a thing that may be depended on; to warrant; as, to guarantee the execution of a treaty. The United States shall guarantee to every State in this Union a republican form of government. Constitution of the U. S.

Sources