done or accomplished while sitting down

sit-down meetings between the two party leaders.

(of a meal or food) served to or intended for persons seated at a table

a sit-down dinner.

Informal . a period or instance of sitting, as to relax, talk, or the like

They had a profitable sit-down together.

sit-down strike.

a protest demonstration whereby participants refuse to move from a public place.

Informal . a meal, esp. a dinner, served to persons who are seated at a table.