From Longman Dictionary of Contemporary EnglishWaterlooWa‧ter‧loo /ˌwɔːtəˈluː◂ $ ˌwɔːtər-, ˌwɑː-/ 1 → the Battle of Waterloo2 → meet your Waterloo3 one of the main railway stations in London, just south of the River Thames. Trains from Waterloo go to the south and southwest of England.