Obs. [f. COSS v. + -ER1.] A dealer; a broker; a ‘horse-corser.’ So Cossery (in 5 coseri), barter, bargaining.

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14[?].  Voc., in Wr.-Wülcker, 684/40. Hic mango, a cosyr.

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a. 1400[?].  Morte Arth., 1582. It come neuer of knyghthede … To carpe of coseri, whene captyfis ere takyne.

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