Hello, The slang term for this is Dutch Treat or going Dutch. If you are verbally inviting people out to eat after work or a basic get together with friends, just ask "Is anyone interested in going Dutch at (give the name of the restaurant, date and time)? You can also send an email: Dutch Treat Place: Date: Time: Please let me know if you are interested.
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AnonymousWhat is a luncheonThis is stilted. You should see the definition here http://dictionary.cambridge.org/dictionary/british/luncheon In everyday English, people normally say lunch.
billydHello,The slang term for this is Dutch Treat or going Dutch.It would be helpful for learners if you explain where in the world, that term is used. Is it the USA?
fivejedjonit's common enough in British English.In American English as well.