Etymology
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upwind (adv.)

also up-wind, 1838, from up (adv.) + wind (n.1). Originally a nautical term. As an adjective from 1892.

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Definitions of upwind
1
upwind (adv.)
away from the wind;
Synonyms: leeward
upwind (adv.)
in the direction opposite to the direction the wind is blowing;
they flew upwind
Synonyms: against the wind / into the wind
2
upwind (adj.)
towards the side exposed to wind;
Synonyms: weather
From wordnet.princeton.edu