coupon

A section of a ticket, showing the holder to be entitled to some specified accommodation or service, as to a passage over a designated line of travel, a particular seat in a theater, a discount, etc.

A voucher issued by a manufacturer or retailer which offers a discount on a particular product.

Any interest payment made or due on a bond, debenture or similar (no longer by a physical coupon).

A small sample of a bulk material, prepared so that test failure will be representative.

(UK, historical) The letter sent to parliamentary candidates at the 1918 general election, endorsing them as official representatives of the coalition government.

(Scotland) A person's face.

(no longer used) A certificate of interest due, printed at the bottom of transferable bonds (state, railroad, etc.), given for a term of years, designed to be cut off and presented for payment when the interest is due; an interest warrant.

To use coupons to a such extent that makes the user actively looking for coupons in magazines, online and whatever they can be found.