will have been guaranteeing

• future perfect progressive

  future perfect progressive

  Used to describe a continuous action that will progress up until a designated point of completion in the future.

  of guarantee.
  guarantee

  noun

  a promise or assurance, especially one in writing, that something is of specified quality, content, benefit, etc., or that it will perform satisfactorily for a given length of time.

Related Words

• agreement
• assurance
• certificate
• collateral
• contract
• deposit
• insurance
• security
• warranty