rest assured (that)
used to tell someone not to worry, because what you say about a situation is true

[TahlilGaran] Dictionary of Contemporary English ▲

rest assured
to be certain something will happen.
I know this fellow well, and you can rest assured he will give you good advice.

[TahlilGaran] English Idioms Dictionary ▲

rest assured
to be assured, to be certain
"You can rest assured that I will be at work early every morning this week."

[TahlilGaran] English Idioms Dictionary ▲

rest assured
v. phr. To be convinced; persuaded; certain and unworried.
"Please rest assured," he said seriously, "that I will keep all of my promises."

[TahlilGaran] English Idioms Dictionary ▲