Definition of sit-down adjective from the Oxford Advanced Learner's Dictionary

 

sit-down

 adjective
adjective
BrE
 
; NAmE
 
[only before noun]
 
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involving people sitting down a sit-down protest (= in which people sit down to block a road or the entrance to a building until people listen to their demands) a sit-down meal for 50 wedding guests (= served to people sitting at tables)
See the Oxford Advanced American Dictionary entry: sit-down