- emphasizing that there is no need to worry
- stressing determination to do something
- confidence that something will happen
- You can rest assured that the transaction will be completed by the close of business today.
- The headmaster told the new pupil’s parents to rest assured that this was the best school in the area for sport and science.
- The baker told his customers to rest assured that his bread was freshly baked every morning.
- The policewoman made the old lady a cup of tea and told her to rest assured that they would find her stolen property.
- Rest assured that we are doing everything in our power to prevent this from happening again.
- Cynthia felt she could rest assured that the house she was about to buy was worth the money.
- The doctor told Marion that she could rest assured that the operation had been a complete success. If she continued to do her physio, she would be able to go home in a few days.
In use from the 1500s, this formal expression gives a sense of certainty, trust or confidence in a particular situation.