Unadapted borrowing from French coupé (an elliptical form of carosse coupé (“cut carriage”)), the past participle of couper (“to cut”).
Meanings
(not-comparable, obsolete) Couped.
Fig. 34, Argent, a baton sinister, coupé, gules (the mark of illegitimate descent). 1898, Edward Singleton Holden, A Primer of Heraldry for Americans, page 117:
[...] who was knighted : His Arms were Or, three Barrs Azure on a Canton Argent, a Lyon's Head coupé Gules; 1826, Sir Henry Chauncy, The Historical Antiquities of Hertforshire, page 314:
Grant of Arms and Crest from Hervy Clarenceux : Sablés, a chevron engrayled betwene three bezants, on a chief gold a rose gules between two flower de luces azure. Crest, a horsse head coupé golde pelletey betwene two winges barrey[…] 1863, John Gough Nichols, The Herald and Genealogist, page 82: