sit
v.v. to rest your weight on your bottom rather than your feet, usually on a chair or the floor. You do this when you want to relax or work at a desk.
v. to rest the body on the buttocks and the back of the thighs, typically supported by a seat or the ground. Intransitive in its primary sense, though it can take a direct object in specific regional or informal contexts.
Please sit down and make yourself comfortable.
The students sit at their desks every morning to listen to the teacher's instructions.
While the committee members sit in the gallery to observe the proceedings, they are strictly forbidden from participating in the formal debate occurring on the floor.
The verb is primarily intransitive and often pairs with the particle 'down' or prepositions like 'on' and 'at'.
I am sitting the chairI am sitting on the chairIn its standard sense, the verb is intransitive and requires a preposition to connect to the object being sat upon.