Etymology
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twofer (n.)

1911 (originally in reference to cigars), from two for (a quarter); see two + for.

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Definitions of twofer

twofer (n.)
an offer of two for the price of one;
twofer (n.)
a coupon that allows the holder to purchase two items (as two tickets to a play) for the price of one;
From wordnet.princeton.edu