Chill out and Lay down

Chill out verb - To become still and orderly.

Lay down and chill out are semantically related In some cases you can replace term "Lay down" with "Chill out", this phrasal verbs are similar.

Lay down verb - To put into effect through legislative or authoritative action.

Chill out and lay down are semantically related in relax topic. Sometimes you can use "Chill out" instead a verb "Lay down".