Definition of "upwind"

upwind¹

/ʌpˈwɪnd/

adjective
comparative more upwind, superlative most upwind
1. exposed to the wind
adverb
comparative more upwind, superlative most upwind
1. in the direction from which the wind is blowing

upwind²

/ʌpˈwaɪnd/

verb
third-person singular simple present upwinds, present participle upwinding, simple past and past participle upwound
1. (transitive, archaic) To wind upwards.
  Quotations
  The cries of all on board were drowned in wind,And wind in thunder drowned;With useless sails upwound.
  1756, William Jay Smith, The Tempest
2. (transitive, archaic) To wind up (a mechanism).
  Quotations
  Tell me not of a huge machine, / Going like a clock upwound; / All measured out each space between, / Marked out each weary round.
  1878, Charlotte Mary Yonge, The Disturbing Element, Or, Chronicles of the Blue-Bell Society