Definition of upwind adverb from the Oxford Advanced Learner's Dictionary

 

upwind

 adverb,adjective
adverb, adjective
BrE BrE//ˌʌpˈwɪnd//
 
; NAmE NAmE//ˌʌpˈwɪnd//
 
Wind
 
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in the opposite direction to the way in which the wind is blowing to sail upwind The house was upwind of the factory and its smells (= the wind did not blow the smells towards the house). opposite downwind See related entries: Wind
See the Oxford Advanced American Dictionary entry: upwind