Definitions for upwindˈʌpˈwɪnd
Random House Webster's College Dictionary
toward or against the wind or the direction from which it is blowing.
(adj.)moving or situated toward or in the direction from which the wind is blowing.
Origin of upwind:
towards the side exposed to wind
toward the wind
"they were sailing leeward"
upwind, against the wind, into the wind(adverb)
in the direction opposite to the direction the wind is blowing
"they flew upwind"
in the direction from which the wind is blowing
exposed to the wind
to wind up