/ ˌɒmbʊˈʃʊə(r); NAmE ˌɑːmbʊˈʃʊr/ noun ( music )
1.
the shape of the mouth when playing a wind instrument
2.
the mouthpiece of a flute
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WORD ORIGIN
mid 18th cent.: French , from s'emboucher discharge itself by the mouth, from emboucher put in or to the mouth, from em- into + bouche mouth.