Verb settle down has 3 senses
  1. settle, settle down - settle into a position, usually on a surface or ground; "dust settled on the roofs"
    --1 is one way to put, set, place, pose, position, lay
    Sample sentences:
    Something is ----ing PP
    Somebody ----s PP
  2. settle, root, take root, steady down, settle down - become settled or established and stable in one's residence or life style; "He finally settled down"
    --2 is one way to stabilize, stabilise
    Sample sentences:
    Somebody ----s
    Somebody ----s PP
  3. calm, calm down, cool off, chill out, simmer down, settle down, cool it - 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."
    --3 is one way to change state, turn
    Sample sentences:
    Something ----s
    Somebody ----s
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