Oxford Dictionary English boiler suit noun noun BrE BrE//ˈbɔɪlə suːt// , BrE//ˈbɔɪlə sjuːt// ; NAmE NAmE//ˈbɔɪlər suːt// (especially British English) (usually North American English coveralls) Add to my wordlistjump to other results a piece of clothing like trousers/pants and a jacket in one piece, worn for doing dirty work compare overallsCheck pronunciation: boiler suit oxfordlearnersdictionaries.com