Children's, Intermediate and Advanced Online English Dictionary & Thesaurus

Comprehensive
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duck1 any of numerous birds that live in and near water and have webbed feet for swimming and a large flat bill. [3 definitions]
duck2 to lower one's head or whole body quickly, as to hide or to avoid a blow or contact with a moving object. [7 definitions]
duck3 a very strong fabric made of cotton or linen and resembling canvas. [2 definitions]