I. ˈsit-down 1 BrE AmE adjective
1 . a sit-down meal or restaurant is one in which you sit at a table and eat a formal meal:
a sit-down meal for 20 people
2 . sit-down strike/protest a protest in which people sit down, especially to block a road or other public place, until their demands are considered or agreed to ⇨ sit-in
II. sit-down 2 BrE AmE noun [singular] British English
if you have a sit-down, you sit and rest for a short while:
You look as if you need a sit-down.