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Webster 1828 Edition

ppr.

Uttering with an affected swelling voice.

mouthing

mouthing ‎(plural mouthings)

The act of forming a shape with the mouth, especially as part of sign language.
- 2013, Robert Bayley, ‎Richard Cameron, ‎Ceil Lucas, The Oxford Handbook of Sociolinguistics (page 382)
  Mouthings tend to occur most often when signers are manually articulating nouns, open-class items, and morphologically simpler signs (see Crasborn et al. 2008).