Meaning

noun restraint consisting of a rope (or light chain) used to restrain an animal

verb tie with a tether

originFrom Middle English tether, teder, from Old English *tēoder and/or Old Norse tjóðr ( > Danish tøjr, Swedish tjuder); both from Proto-Germanic *teudrą (“rope; cord; shaft”), of uncertain origin. Perhaps from Proto-Indo-European *dewtro-, from Proto-Indo-European *dew- (“to tie”), or from Proto-Indo-European *dewk- (“to pull”). Cognate with North German Tüder (“tether for binding the cattle”),…

Etymology from Wiktionary, CC BY-SA 3.0