guarantee - definition and synonyms

noun [countable] 

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  1. 1
    something that makes it certain that something will happen
    guarantee of:

    Massive investment is no guarantee of success.

    guarantee against:

    Being with you is my guarantee against them harming me.

    guarantee (that):

    Going to court is the best guarantee that you will both be treated fairly.

    There’s no guarantee you will get in without a ticket.

  2. 2
    a promise that something will definitely happen
    give (someone) a guarantee:

    I can’t give you any guarantees at the moment.

    guarantee (that):

    The company has given a guarantee that there will be no job losses.

    guarantee against:

    The tribes wanted secure guarantees against future invasions.

    guarantee of:

    The university insisted on a written guarantee of good conduct from his uncle.

    cast-iron guarantee (=one that is completely reliable):

    We need a cast-iron guarantee that the trade in endangered animals will stop.

     Synonyms and related words
  3. 3
    an agreement that if something that you buy does not work, it will be repaired or replaced, or you can have your money back

    Many companies offer a 30-day money-back guarantee.

    under guarantee (=protected by a company’s guarantee):

    My watch is still under guarantee, so they’ll repair it for free.

    something carries a guarantee:

    Window frames carry a thirty year guarantee against rot or decay.

  4. 4
    an agreement to pay back money that someone else owes if they cannot pay it back themselves
    guarantee for:

    The bank requires a guarantee for its loans.

    1. a.
      an amount of money or a valuable object that you leave with someone until you have paid the money that you owe or have done something that you promised to do