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Definition of weir noun from the Oxford Advanced Learner's Dictionary

weir

noun
 
/wɪə(r)/
 
/wɪr/
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  1. a low wall or barrier built across a river in order to control the flow of water or change its direction
    • Flood water was pouring over the weir in a thundering torrent.
    Topics Geographyc2
    Word OriginOld English wer, from werian ‘dam up’.
See weir in the Oxford Advanced American Dictionary
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