There are many different synonyms for the phrase "sit down on." Some popular options include "take a seat," "settle onto," "rest one's bottom on," "lower oneself onto," "plant oneself on," and "sink into." Other options include "perch on," "nestle into," "alight on," "occupy oneself with a chair," and "assume a chair." Regardless of the specific wording chosen, the meaning of the phrase remains the same - to physically move one's body into a seated position on a particular surface. Whether it's a chair, a couch, or a park bench, there are always plenty of ways to describe the act of sitting down.