When it comes to finding synonyms for "plops down," there are several options to choose from. Some of the most commonly used alternatives include "plunks," "plonks," "drops," "sits," and "flops." Each of these words can be used to describe the action of someone or something settling down into a particular position, whether it be on a sofa, chair, or even the ground. While each synonym has its unique connotations, they all convey a sense of casualness and relaxation that is akin to the act of "plopping down" in a comfortable spot.