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English definition of “arm”

arm

noun [C] (OF LAND/WATER)    /ɑːm/ US  /ɑːrm/
An arm of land or water is a long, thin part of it that is joined to a larger area.Bays and gulfsCoasts and beachesPromontories and peninsulas
(Definition of arm noun (OF LAND/WATER) from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)
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