intransitive. To be at ease; to have peace of mind. Frequently in negative contexts.

intransitive. spec. With adjectives denoting a feeling of certainty or confidence, now esp. in to rest assured.

to breathe freely (also easy, easily) and variants: to feel at ease in a particular situation or environment. Also: to relax; to recover one's…

The action of settle, v.; settling, settlement. to take settle: to be settled, to be at ease.

figurative. Frequently with out. To calm down, relax, take it easy. Also as int. phr. slang. (originally U.S.).