Settle down and Set down

Settle down verb - To become still and orderly.

Set down and settle down are semantically related in land topic. In some cases you can use "Set down" instead a verb "Settle down", when it comes to topics like fall.

Set down verb - To cause to sit down.

Settle down and set down are semantically related in land topic. Sometimes you can use "Settle down" instead a verb "Set down", if it concerns topics such as fall.