Overalls are work trousers with a front panel and straps over the shoulders. A pair of overalls, put on overalls, oily overalls.
The bib and braces are what distinguish them from ordinary work trousers, and the design keeps the chest covered while leaving the arms free. British English also uses overalls for a one-piece boiler suit, where American English says coveralls and reserves overalls for the bib kind — which is a reliable source of confusion. The word is plural, like trousers, and takes a pair of.
1nounoverallsWork trousers with a front panel and shoulder straps.
“The painter wore white overalls covered in splashes of paint.”
overalls is work clothing.
Also accepted in games: dungarees