easenoun(COMFORT)

at ease

phrase
(of a soldier) standing with feet apart and hands behind the back: …稍息（姿势）
The soldiers come to attention when an officer enters the room and stand at ease when the officer allows it.
The officers were at ease until the White House doors opened, and then they all stood at attention for the President's arrival.
You must stand at attention until the commanding officer issues the command, "At ease".
He ordered his troops to stand at ease.
The sentries were given permission to hold their rifles with both hands while standing at ease.
See also