1. A negotiable certificate that can be detached and redeemed as needed
   "She used a coupon to get a discount on her groceries";
   - voucher
    
2. A test sample of some substance
   "The lab technician prepared a coupon of the new alloy for stress testing"

1. Use coupons to save money when shopping
   "She couponed extensively to reduce her grocery expenses"

Derived forms: couponed, couponing, coupons

Type of: commercial document, commercial instrument, sample

Encyclopedia: Coupon, William