sit

sit /ˈsɪt/ verb
sits; sat /ˈsæt/ ; sitting
sit
/ˈsɪt/
verb
sits; sat /ˈsæt/ ; sitting
Britannica Dictionary definition of SIT
1 
a  [no object] : to be in a position in which your bottom is resting on a chair, the ground, etc., especially with your back upright
b  [no object] : to begin to sit : to put yourself in a sitting position
c  always followed by an adverb or preposition, [+ object] : to cause (someone) to be seated : to put (someone) in a sitting position
2 
[no object]
a  of an animal : to rest with the tail end of the body on the floor and the front legs straight
b  of a bird : to rest on the top or the edge of something
3 
always followed by an adverb or preposition, [no object] : to be or stay in a particular place, position, or condition
4 
[no object] : to be a member of an official group that has meetings
5 
[no object] : to meet in order to carry on official business : to hold a session
6 
[no object]
a  : to take care of a child while the child's parents are away : babysit
b  : to take care of something while the owner is away — usually used in combination
— see also house-sit
7 
[+ object] US : to have enough seats for (a certain number of people)
8 
[no object] : to pose for a portrait, photograph, etc.
9 
British : to take (an examination)
[+ object]
[no object]

sit around

[phrasal verb] also chiefly British sit about
: to spend time doing nothing useful

sit back

[phrasal verb]
1 
: to get into a comfortable and relaxed position in a chair, seat, etc.
2 
: to make no effort to do something

sit by

[phrasal verb]
: to make no effort to stop something bad or unpleasant from happening

sit down

[phrasal verb]
1 
: to begin to sit : to put yourself into a sitting position
— sometimes used figuratively
2 
be sitting down : to be in a sitting position
3 
sit (someone) down : to cause (someone) to be seated : to put or get (someone) in a sitting position

sit in

[phrasal verb]
1 
: to take the place of someone who is not present
2 
sit in on (something) : to attend (something, such as a class or meeting) without officially participating

sit on

[phrasal verb]
sit on (something) informal
: to delay dealing with or talking about (something)

sit on your hands

: to make no effort to deal with or respond to something

sit on your laurels

— see laurel

sit out

[phrasal verb]
1 
sit out (something) or sit (something) out
: to stay in a place and wait for (something) to end
2 
: to not take part in (something)

sit pretty

informal
: to be in a very good or favorable situation — usually used as be sitting pretty

sit through

[phrasal verb]
sit through (something)
: to go to (something) and stay until the end

sit tight

1 
: to not move or change your position : to stay where you are
2 
: to not change your situation : to stay in the same situation

sit up

[phrasal verb]
1 
: to stay awake until late at night
2 
: to sit with your back very straight
3 
sit up or sit (someone) up : to move or help (someone) to move into a sitting position

sit up and take notice

: to suddenly pay attention to (someone or something)

sit well/comfortably (etc.)

◊ If something does not sit well/comfortably (etc.) with you, you do not like it.