Confusable words

assure vs ensure: what's the difference?

assure
verb
vs
ensure
verb
? ?

Assure and ensure are spelled almost the same and often get swapped, but they point at different things. You assure a person. You ensure an outcome.

Assure

verb

To assure is to tell someone something confidently, usually to make them feel less worried.

  • I assured her that the flight would not be delayed.
  • He assured the team that the budget was still on track.

Ensure

verb

To ensure is to make certain that something happens or is true.

  • Please ensure the doors are locked before you leave.
  • We ensure every order is checked twice before shipping.

Side by side

assure ensure
What it acts on A person A result or fact
Purpose To comfort or reassure To guarantee an outcome
Simple test "I assure you" means trust me "I ensure this happens" means I make it happen

Quick rule

Assure a worried person. Ensure a result actually happens. If no person is being reassured, reach for ensure.

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