In English, what does "to ensure" mean?

The phrase "to ensure" means to guarantee that something will happen or that a certain condition will be met. It implies taking necessary actions or making provisions to confirm that the desired outcome is achieved. For example, if someone says they will ensure safety measures are in place, they are pledging to take steps that will guarantee the safety of the environment or situation.

This understanding makes "to guarantee" the most accurate interpretation of "to ensure," as both phrases convey a sense of certainty and commitment to a particular outcome. Other choices, such as "to call," "to cancel," and "to clarify," do not share this meaning and relate to entirely different actions or processes. Thus, the choice that aligns with the definition of "to ensure" is the one that indicates a promise of certainty or provision.