tetherEnglishOxford American Thesaurustether verb the horse had been tethered to a post: tie, tie up, hitch, rope, chain; fasten, secure; bind, fetter, shackle, restrain. ▷antonyms unleash, release.noun rope, chain, cord, lead, leash; fetter, restraint; halter; archaic lyam.□ at the end of one's tetherthe poor man was clearly at the end of his tether: at one's wits' end, desperate, not knowing which way to turn, unable to cope; North American at the end of one's rope.