1
general::
Phrase(s): sit down
to be seated; to sit on something, such as a chair. • Please sit down and make yourself comfortable. • Can I sit down here?
McGrawhill's American Idioms And Phrasal Verbs
2
general::
1. Take a seat, as in Won't you sit down? I won't be long. [c. 1200] 2. sit down to. Prepare to eat a meal, as in At six we all sat down to dinner. [Late 1500s]
American Heritage Idioms