From Longman Dictionary of Contemporary Englishsawn-off shotgunˌsawn-off ˈshotgun British English, sawed-off shotgun American English noun [countable] PMWa shotgun whose barrel (=long thin tube) has been cut short so that it is easier to hide
Examples from the Corpus
sawn-off shotgun• He is further charged with possessing a sawn-off shotgun.• Under the coat was a sawn-off shotgun and he fired.• A sawn-off shotgun was seized and a man was arrested.• Or course the sawn-off shotgun he was reloading was a bit of a giveaway, though. 