au repos înseamnă în Engleză

at rest▼◼◼◼( In a state of inactivity or repose, either physical or mental)
preposition
[UK: ət rest] [US: ət ˈrest]

rest mass▼◼◼◼(mass of a body when it is not moving)
noun
[UK: rest mæs] [US: ˈrest ˈmæs]