To substitute; to take somebody's place.
sit tight
To wait patiently; to take no action; to remain quiet or relatively mo …
sit still
To accept, tolerate, or acquiesce.
sit on one's hands
To remain idle when action is needed, perhaps because of fear, ignoran …
sit on
To block, suppress, restrain (something).
sit back
To relax, to not exert oneself.
sit through
To unwillingly stay seated until the end of an event.