a portion of a certificate, ticket, label, advertisement, or the like, set off from the main body by dotted lines or the like to emphasize its separability, entitling the holder to something, as a gift or discount, or for use as an order blank, a contest entry form, etc.
a separate certificate, ticket, etc., for the same purpose.
one of a number of small detachable certificates calling for periodic interest payments on a bearer bond.
1815-25; < French;Old Frenchcolpon piece cut off, equivalent to colp(er) to cut (see cope1) + -on noun suffix
Coupon, related to cope and coup, is of French origin. It has developed an American pronunciation variant
[kyoo-pon] /ˈkyu pɒn/ (Show IPA) with an unhistorical y -sound not justified by the spelling. This pronunciation is used by educated speakers and is well-established as perfectly standard, although it is sometimes criticized. Its development may have been encouraged by analogy with words like curious, cupid, and cute, where c is followed by a “long u ” and the [y] /y/ is mandatory.
1822, "certificate of interest due on a bond" (which could be cut from the bond and presented for payment), from Fr. coupon, from O.Fr. coupon "piece cut off," from couper "to cut," from coup "a blow." Meaning widened to "discount ticket" 1860s by British travel agent Thomas Cook. The specific advertising sense is from 1906.