mouthpiece

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mouthpiece /ˈmaʊθˌpiːs/ noun
plural mouthpieces
mouthpiece
/ˈmaʊθˌpiːs/
noun
plural mouthpieces
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