A squatter is someone who occupies or lives in a place that doesn't belong to them.
You might hear about squatters when talking about abandoned buildings or properties. Sometimes people move into empty houses or apartments without permission, and this can cause problems for the rightful owners or local authorities. The word "squatter" usually implies that the person is staying in the place without paying rent or having any official agreement to be there.
One who squats, sits down idly.
