Adjective upwind has 1 sense
  1. upwind, weather - towards the side exposed to wind
    Antonym: leeward (indirect, via windward)
,Adverbial upwind has 2 senses
  1. leeward, upwind - toward the wind; "they were sailing leeward"
    Antonyms: windward, downwind
  2. upwind, against the wind, into the wind - in the direction opposite to the direction the wind is blowing; "they flew upwind"
    Antonyms: downwind, with the wind
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