Leasing \Leas"ing\, n. [AS. le['a]sung, fr. le['a]s loose, false, deceitful. See {-less}, {Loose}, a.] The act of lying; falsehood; a lie or lies. [Archaic] --Spenser. Thou shalt destroy them that speak leasing. --Ps. v. 6. Blessed be the lips that such a leasing told. --Fairfax. {Leasing making} (Scots Law), the uttering of lies or libels upon the personal character of the sovereign, his court, or his family. --Bp. Burnet.