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foghorn

noun [C]
 
 
/ˈfɒɡ.hɔːn/ US  /ˈfɑːɡ.hɔːrn/

Definition

a horn that makes a very loud sound to warn ships that they are close to land or other ships: He has a voice like a foghorn (= an unpleasantly loud voice).Navigation and shipwrecks
(Definition of foghorn noun from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)

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