1.
If you have a sit-down , you sit down and rest for a short time. ( BRIT INFORMAL )
All he wanted was a cup of tea and a sit-down.
N-SING : a N
2.
A sit-down meal is served to people sitting at tables.
A sit-down dinner was followed by a disco.
ADJ : ADJ n
3.
In a sit-down protest, people refuse to leave a place until they get what they want.
Teachers staged a sit-down protest in front of the president’s office.
ADJ : ADJ n