Definition of guarantee verb from the Oxford Advanced Learner's Dictionary

        

    guarantee

     verb
    verb
    BrE BrE//ˌɡærənˈtiː//
     
    ; NAmE NAmE//ˌɡærənˈtiː//
     
    Verb Forms present simple I / you / we / they guarantee
    BrE BrE//ˌɡærənˈtiː//
     
    ; NAmE NAmE//ˌɡærənˈtiː//
     
    he / she / it guarantees
    BrE BrE//ˌɡærənˈtiːz//
     
    ; NAmE NAmE//ˌɡærənˈtiːz//
     
    past simple guaranteed
    BrE BrE//ˌɡærənˈtiːd//
     
    ; NAmE NAmE//ˌɡærənˈtiːd//
     
    past participle guaranteed
    BrE BrE//ˌɡærənˈtiːd//
     
    ; NAmE NAmE//ˌɡærənˈtiːd//
     
    -ing form guaranteeing
    BrE BrE//ˌɡærənˈtiːɪŋ//
     
    ; NAmE NAmE//ˌɡærənˈtiːɪŋ//
     
     
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  1. 1  to promise to do something; to promise something will happen guarantee something Basic human rights, including freedom of speech, are now guaranteed. guarantee (that)… We cannot guarantee (that) our flights will never be delayed. guarantee somebody something The ticket will guarantee you free entry. guarantee to do something We guarantee to deliver your goods within a week.
  2. 2  guarantee something (against something) to give a written promise to replace or repair a product free if it goes wrong This iron is guaranteed for a year against faulty workmanship.
  3. 3  to make something certain to happen guarantee something Tonight's victory guarantees the team's place in the final. guarantee somebody something These days getting a degree doesn't guarantee you a job.
  4. 4guarantee (that)… to be certain that something will happen You can guarantee (that) the children will start being naughty as soon as they have to go to bed.
  5. 5to agree to be legally responsible for something or for doing something, especially for paying back money that somebody else owes if they cannot pay it back themselves guarantee something to guarantee a bank loan guarantee to do something to guarantee to pay somebody’s debts guarantee that… I guarantee that he will appear in court.
  6. Word Origin late 17th cent. (in the sense ‘guarantor’): perhaps from Spanish garante, corresponding to French garant, later influenced by French garantie ‘guaranty’.Extra examples A degree does not automatically guarantee you a job. All our electrical goods are fully guaranteed. I can absolutely guarantee that you will enjoy the show. I personally guarantee total and immediate support in all measures undertaken. The complicated electoral system effectively guarantees the president’s re-election. The outcome is by no means guaranteed. The process of training and qualification does not automatically guarantee you a job. His father agreed to guarantee the bank loan. The film is virtually guaranteed to do well at the box office. These days getting a degree doesn’t guarantee you a job. Tonight’s victory guarantees the team’s place in the final. You can guarantee that the children will start being naughty as soon as they have to go to bed.Idioms
    be guaranteed to do something
     
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    to be certain to have a particular result If we try to keep it a secret, she's guaranteed to find out. That kind of behaviour is guaranteed to make him angry. Synonymscertainbound sure definite guaranteedThese are all words describing something that will definitely happen or is definitely true.certain that you can rely on to happen or be true:It’s certain that they will agree. They are certain to agree.bound [not before noun] certain to happen, or to do or be something. Bound is only used in the phrase bound to do/​be, etc.:There are bound to be changes when the new system is introduced. You’ve done so much work—you’re bound to pass the exam.sure certain to happen or be true; that can be trusted or relied on:She’s sure to be picked for the team. It’s sure to rain.definite (rather informal) certain to happen; that is not going to change:Is it definite that he’s leaving?guaranteed certain to have a particular result:That kind of behaviour is guaranteed to make him angry.Patterns certain/​sure of something certain/​bound/​sure/​guaranteed to do something certain/​definite that… I couldn’t say for certain/​sure/​definite.
See the Oxford Advanced American Dictionary entry: guarantee