Definition of muff glass in English:

muff glass

noun

historical
  • Glass which has been muffed or muffled.

Origin

Mid 19th century; earliest use found in The Morning Star. Probably from either muff or muff (although the verb is first attested slightly later) + glass.

Pronunciation

muff glass

/ˈmʌf ɡlas//ˈmʌf ɡlɑːs/