sit has 9 distinct synonyms spread across 7 of its 10 senses. Each sense below keeps its own list, because a synonym belongs to a meaning and not to a word: swapping one sense's substitute into another sense's sentence is how a thesaurus makes writing worse. Its 2 recorded opposites are stand, lie.
Counts are distinct word forms across every sense. A synonym that appears under three senses is counted once here and shown three times below, under each sense it belongs to.
be around, often idly or without specific purpose
“The object sat in the corner”
be in session
“When does the court of law sit?”
be located or situated somewhere
“The White House sits on Pennsylvania Avenue”
serve in a specific professional capacity
“the priest sat for confession”
Synonyms, antonyms and the broader and narrower relations for sit come from Princeton University’s WordNet. Full sources and licences.