Artificial intelligent assistant

undergrowl

ˈundergrowl
  (under-1 9 b.)

c 1848 J. Keegan Leg. & Poems (1907) 480 ‘Och, you thief of the world!’ cried the woman, in a kind of under growl. 1895 Meredith Amazing Marriage xxxii, The shaking of her gown and the snarl in the undergrowl sounded insatiate.

Oxford English Dictionary

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