Upwind means into the wind, or on the side it blows from. Sail upwind, stay upwind, upwind of the fire.
Staying upwind is the standing advice near smoke, gas or fire, and it is why hunters approach that way — your scent goes downwind. A sailing boat cannot go straight upwind and must tack across it. Note downwind, its opposite; and that the compound is simply up plus wind.
1adverbupwindInto the wind, or on the side it blows from.
“The deer smelled the hunters because they were standing upwind.”
upwind is a direction.
Also accepted in games: windward
Middle English
wynd
English
wind
English, today
upwind
Built from
From up- + wind. wind comes from Middle English wynd. From Middle English wynd,wind, from Old English wind (“wind”), from Proto-West Germanic wind, from Proto-Germanic windaz, from Proto-Indo-European h₂wéh₁n̥tos (“wind”), from earlier h₂wéh₁n̥ts (“wind”), derived from the present participle of h₂weh₁- (“to blow”). 2
Etymology from Wiktionary, CC BY-SA