When we talk about the antonyms for the phrase "sit top of," we think of words like "underneath," "below," and "beneath." These words indicate that something is situated or located below or underneath another object. The opposite of sitting on top of something is being situated below or under it. Other antonyms for "sit top of" could be "beneath," "under," "down," or "below." When we say that something is beneath or under another object, we imply that it is positioned directly below it. Therefore, when it comes to antonyms for "sit top of," we can use words that indicate a position below or underneath to convey the opposite meaning.