"settle down" has the idea of becoming calm after a time of great movement or activity. Eventually, all adventurous young men will want to settle down, get married and have a family. The hunter-gatherers settled down on good land and became farmers.
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Gene93Thumbs up to that. I am familiar with this meaning of the verb. But when we move into a new house, we need some time to settle in. At least I think so. I wouldn't use "down" here."Settle in" has a different meaning. It means to get accustomed to new surroundings.
Gene93