noun
a state of being calm, relaxed, and free from worry or stress
verb
to be confident or certain about something
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Rest assured, we have taken all necessary precautions to ensure the safety of our customers.
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You can rest assured that we've got your back.
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Don't worry, you can rest assured that everything will be lit.
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Like a ship anchored in a storm, rest assured that I will always be there for you.