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double–barreled

double–barreled (US) adjective
or British double–barrelled /ˌdʌbəlˈberəld/
double–barreled (US)
adjective
or British double–barrelled /ˌdʌbəlˈberəld/
Britannica Dictionary definition of DOUBLE–BARRELED
of a gun : having two tubes (called barrels) that bullets or pellets are shot through
US : having two parts or purposes