Source : WordNet®

settle down
     v 1: settle into a position, usually on a surface or ground;
          "dust settled on the roofs" [syn: {settle}]
     2: become settled or established and stable in one's residence
        or life style; "He finally settled down" [syn: {settle}, {root},
         {take root}, {steady down}]
     3: 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}, {cool it}]