Etymology
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double-barreled (adj.)

1709, of a gun, "having two barrels;" see double (adj.) + barrel (n.). Figurative sense of "serving two purposes" is by 1777.

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Definitions of double-barreled
1
double-barreled (adj.)
having two purposes; twofold; "our double-barreled desire to make things profitable as well as attractive"- Louis Kronenbergers;
Synonyms: double-barrelled
2
DOUBLE-BARRELED (adj.)
having two barrels mounted side by side;
a double-barreled shotgun
Synonyms: double-barreled^double-barrelled
From wordnet.princeton.edu