'settle down' definitions:

Definition of 'settle down'

From: WordNet
verb
Settle into a position, usually on a surface or ground; "dust settled on the roofs" [syn: settle, settle down]
verb
Become settled or established and stable in one's residence or life style; "He finally settled down" [syn: settle, root, take root, steady down, settle down]
verb
Become quiet or calm, especially after a state of agitation; "After the fight both men need to cool off."; "It took a while after the baby was born for things to settle down again." [syn: calm, calm down, cool off, chill out, simmer down, settle down, cool it]

Synonyms of 'settle down'

From: Moby Thesaurus