ensure
verb (used with object)
to secure or guarantee.
Used to describe an action that will be fully completed or achieved by a specific point in the future.
Examples are provided to illustrate real-world usage of words in context. Any opinions expressed do not reflect the views of Dictionary.com.
You will have ensured my fulfilment of my promise before I can ensure yours; but I take your word.’
From The Hand of Ethelberta by Thomas Hardy