English

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Etymology 1

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grin +‎ -y

Adjective

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grinny (comparative more grinny, superlative most grinny)

  1. Having or resembling a grin.
    a grinny face
    • 2019, Liam Livings, Love on the Dancefloor, page 10:
      That cheeky, grinny smile with those twinkly blue eyes

Etymology 2

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The phrase "grinny chipmunk" is first attested in 1898 (see quotation below). Perhaps from Etymology 1 above. (This etymology is missing or incomplete. Please add to it, or discuss it at the Etymology scriptorium.)

Alternative forms

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Noun

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grinny (plural grinnies)

  1. (Western Pennsylvania) The Eastern chipmunk, Tamias striatus.
    • [1898 November, B. W. Mitchell, “A Thanksgiving Deer Hunt in West Virginia”, in Outing, page 143:
      Reason thus, and if your heart beats till it hurts your ribs as a gray squirrel whisks across the dry leaves or a ‘grinny chipmunk’ waves you a derisive signal with his little flag from a log before your very nose, call yourself ‘fool,’ ‘idiot,’ anything that comes handy.]