leashEnglishOxford American Thesaurusleash noun 1 you should always keep your dog on a leash: lead, rein, tether, rope, cord, chain, line, strap; restraint; archaic lyam. 2 the adolescent Wolfgang found himself off the parental leash: control, restraint, check, curb, rein, hold, discipline. □ straining at the leasheach year some 300 youngsters are straining at the leash to get into professional golf: eager, impatient, anxious, enthusiastic; informal itching, dying, gagging.verb 1 she called the dog to heel so that she could leash him: put a leash on, put a lead on, fasten, hitch up, tether, tie up, secure, bind, fetter; confine, restrain. ▷antonyms unleash, release. 2 the ire in her face was barely leashed: curb, control, keep under control, check, restrain, hold back, suppress. ▷antonyms unleash, release.