joust: [13] The underlying meaning of joust is simply an ‘encounter’. The word came from Old French juster, which originally meant ‘bring together’, and hence by extension ‘join battle’ and ‘fight on horse-back’. The Old French verb goes back to Vulgar Latin *juxtāre ‘come together’, a derivative of Latin juxtā ‘close’ (source of English juxtaposition [17]). And juxtā itself comes from the same ultimate source as English join and yoke. Jostle [14] originated as a derivative of joust. => join, jostle, juxtapose[joust etymology, joust origin, 英语词源]