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make sure (third-person singular simple present makes sure, present participle making sure, simple past and past participle made sure)

  1. To ensure; to take care that something happens.
    When you leave, make sure you have locked the door behind you.
    I'm going to make sure that I get to the interview on time.
  2. (obsolete) To betroth.
    • Cotgrave
      she that's made sure to him she loves not well