From Longman Dictionary of Contemporary Englishsit down phrasal verb1SITto be in a sittingposition or get into a sitting position 🔊 It was good to be sitting down eating dinner with my family. 🔊 Sit down, Amy – you look tired.sit yourself down 🔊 Sit yourself down and have a drink.2sit somebody down to make someone sit down or help them to sit downsit somebody down in/on 🔊 I helped her into the room and sat her down in an armchair.3sit down and do somethingATTENTION to try to solve a problem or deal with something that needs to be done, by giving it all your attention 🔊 The three of us need to sit down and have a talk. 🔊 Sit down and work out just what you spend. →sit→ See Verb table
sit-down• The others acknowledged us cheerily, clearly relieved to have been allowed 30 seconds for a sit-down.• My friends had to have their first sit-down in sight of the car.• Yes, George and I have had our sit-down.From Longman Business Dictionarysit-downˈsit-down adjectivesit-down protest/strike a protest in which people sit down, especially to block a road or other public place, until their demands are listened toWorkers at the country’s second-largest steel factory began a sit-down strike.Investors staged sit-down protests, demanding special government measures to prevent a stock market crash.