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mouthpiece

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mouthpiece/ˈmaʊθˌpiːs/noun
pluralmouthpieces
mouthpiece
/ˈmaʊθˌpiːs/
noun
pluralmouthpieces
Learner's definition of MOUTHPIECE  
[count]
: a part of something that is placed between or near your lips
: someone who speaks for another person or for a group or organization
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