definition 1: to cause to be a certainty.
example: Those dark clouds ensure rain.
example: The hotel staff do whatever is necessary to ensure that guests are comfortable.
example: Plenty of fluids and rest will ensure a more speedy recovery.
definition 2: to protect or render safe.
example: She took steps to ensure her reputation against slander.
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Collocations: Words often used in combination with the transitive verb ensure (definition 1)
ensure + NOUN: ~ safety, ~ order, ~ compliance, ~ survival, ~ quality, ~ accuracy, ~ access, ~ security, ~ protection, ~ continuity, ~ consistency, ~ success, ~ delivery, ~ availability, ~ equality, ~ integrity, ~ implementation, ~ reliability, ~ accountability, ~ sustainability, ~ solvency, ~ transparency