[at ease] or [at one's ease] {adj.} or {adv. phr.}
1. In comfort; without pain or bother.
* /You can't feel at ease with a toothache./
2. or [at one's ease] Comfortable in one's mind; relaxed, not troubled. — Often used in the phrase "put at ease" or "put at one's ease."
* /We put Mary at her ease during the thunderstorm by reading her stories./
Compare: AT HOME(2).
Contrast: ILL AT EASE, ON EDGE.
3. Standing with your right foot in place and without talking in military ranks.
* /The sergeant gave his men the command "At ease!"/
Compare: PARADE REST.