In old English law. A feudal prerogative or custom for lords to lie and feast themselves at their tenants' houses. Cowell. COSIN, Cosyn, Cosen. L. Fr. [L. Lat. consanguineus.] In old English law. A collateral relative by blood, as a brother, sister, uncle, &c. Litt. sect. 389, 660. Any relative in the ascending line, above a great grandfather, (besayle). Theloall's Dig. lib. 9, c. 5, 28. Stat. Glocest. c. 2. Britt. c. 89. See Cosinage. COSINAGE, Cosenage. L. Fr. [L. Lat. consanguinitas.] In old English law and practice. Collateral relationship or kindred by blood; consanguinity. Co. Litt. 160 a. The name of a writ (breve de consanguineo,) that anciently lay where a man's great great grandfather, (or tresayle, as he was termed,) or collateral relative, beyond certain degrees, (to both of whom the title cosin was applied,) was seised of lands, &c., in fee on the day of his death, and afterwards a stranger entered and abated, and so kept out the heir. F. N. B. 221. Reg. Orig. 226. Roscoe's Real Act. 127. 3 Bl. Com. 186. But see Blackst. Law Tracts, 24. KelCOST, (Co'st). L. Fr. This is. ham. A contraction of ceo est. COSTAGES, Custages. L. Fr. In old English law. Costs. Stat. Westm. 1, c. 1. Stat. Glocest. c. 1. Britt. c. 17. Yearb. M. 8 Edw. III. 35. Lord Coke derives this word from the verb conster, and that again COSTE, Côte. Fr. and L. Fr. A, or the side. De coste; from, or on the side; collateral. Britt. c. 89, 119.