Meaning

noun the sport of siting on the back of a horse while controlling its movements

noun travel by being carried on horseback

verb sit and travel on the back of animal, usually while controlling its motions

originPIE word *tréyes From trithing (initial /t/ absorbed into preceding north, south, east, west, inner ⟨th⟩ already sometimes /d/ in Middle English), from Middle English trithing, tridinge, from Old English *þriþing, from Old Norse þriðjungr (“third part”), from Proto-Germanic *þridjô (“third”) (English third). Equivalent to third + -ing; compare with farthing (“fourth part”). Cognate with English…

Etymology from Wiktionary, CC BY-SA 3.0