rest assured

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rest assured (third-person singular simple present rests assured, present participle resting assured, simple past and past participle rested assured)

1. (intransitive, idiomatic) Be sure; not need to worry; trust.

   You may rest assured that our best efforts will be put forth to give you complete satisfaction.

   • 1983 April 12, “Pilgrimage”, in Murmur, performed by R.E.M.:

     Rest assured, this will not last.
     Take a turn for the worse.
     Your hate, clipped and distant.
     Your luck, [a] two-headed cow.