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weir (n.)

Old English wer "dam, fence, enclosure," especially one for catching fish (related to werian "dam up"), from Proto-Germanic *wer-jon- (source also of Old Norse ver, Old Frisian and Middle Dutch were, Dutch weer, Old High German wari, German Wehr "defense, protection," Gothic warjan "to defend, protect"), from PIE root *wer- (4) "to cover."

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Definitions of weir

weir (n.)
a low dam built across a stream to raise its level or divert its flow;
weir (n.)
a fence or wattle built across a stream to catch or retain fish;
From wordnet.princeton.edu