#1 settle down v. settle into a position, usually on a surface or ground; "dust settled on the roofs". wn
#2 settle down v. become settled or established and stable in one's residence or life style; "He finally settled down". wn
#3 settle down v. 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.". wn
vizzz