at rest

prep_phrase

(idiomatic) Not moving; stationary. / In a state of inactivity or repose, either physical or mental. / (euphemistic) Dead.

He sat at rest on the park bench.

意味（1）

(idiomatic) Not moving; stationary.

At rest, the car is impressive, but when it's moving, the sight is astounding.

意味（2）

In a state of inactivity or repose, either physical or mental.

意味（3）

(euphemistic) Dead.