Definition of be sure in English:

be sure

phrase

  • [usually in imperative] Do not fail (used to emphasize an instruction):

    [with infinitive] ‘be sure to pop in’
    [with clause] ‘be sure that you know what is required’
    • ‘If you decide to visit Ren or a similar bar be sure to have accompaniment of the best kind.’
    remember to, don't forget to, make sure to, see that you, mind that you, take care to, be certain to, be careful to
    View synonyms