ph.

1. (尤指结婚或买房后)定居，安顿下来
When someone settles down, they start living a quiet life in one place, especially when they get married or buy a house.

2. (历经磨难或变化后)安静下来，平静下来
If a situation or a person that has been going through a lot of problems or changes settles down, they become calm.

3. 集中精力做;开始认真做
If you settle down to do something or to something, you prepare to do it and concentrate on it.

4. 准备,开始(就寝)
If you settle down for the night, you get ready to lie down and sleep.

1. become settled or established and stable in one's residence or life style

e.g. He finally settled down

Synonym: settleroottake rootsteady down

2. become quiet or calm, especially after a state of agitation

e.g. After the fight both men need to cool off.
It took a while after the baby was born for things to settle down again.

Synonym: calmcalm downcool offchill outsimmer downcool it

3. settle into a position, usually on a surface or ground

e.g. dust settled on the roofs

Synonym: settle