leash / lēsh/ • n. a strap or cord for restraining and guiding a dog or other animal. ∎ Falconry a thong or string attached to the jesses of a hawk, used for tying it to a perch or a creance. ∎ fig. a restraint: her bristling temper was kept on a leash. • v. [tr.] put a leash on (a dog). ∎ fig. restrain: his violence was barely leashed. PHRASES: strain at the leash fig. be eager to begin or do something.