or cooter, subs. (common).A sovereign. For synonyms, see CANARY, sense 3. HALF A COUTER = half-a-sovereign.
1857. SNOWDEN, Magistrates Assistant (3 ed.), p. 444, s.v.
1877. W. H. THOMSON, Five Years Penal Servitude, iii. 243. A foulcher, with flimsies and COUTERS for a score of quid in it.
1880. PAYN, A Confidential Agent, I., 207. Well, he gave us half a COUTER at all events, pleaded John in mitigation.