UK:*UK and possibly other pronunciationsUK and possibly other pronunciations/ˈsɪt/US:USA pronunciation: IPA and respellingUSA pronuncation: IPA/sɪt/ ,USA pronunciation: respelling(sit)

Inflections of 'sit' (v): (⇒ conjugate)
v 3rd person singular
v pres pverb, present participle: -ing verb used descriptively or to form progressive verb--for example, "a singing bird," "It is singing."
v pastverb, past simple: Past tense--for example, "He saw the man." "She laughed."
v past pverb, past participle: Verb form used descriptively or to form verbs--for example, "the locked door," "The door has been locked."
WordReference Collins English Usage © 2020
describing a movement
When you sit or sit down, you lower your body until your bottom is resting on something. The past tense and -ed participle of sit is sat.
You usually use sit rather than ‘sit down’ when you mention the place where someone sits.
A woman came and sat next to her.
Sit on this chair, please.
If you are not mentioning the place, use sit down.
She sat down and poured herself a cup of tea.
saying where someone is
If you are sitting somewhere, your bottom is resting on something such as a chair. In standard English, don't say that someone ‘is sat’ somewhere.
They are sitting at their desks.
She was sitting on the edge of the bed.
'sit' also found in these entries:

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