subs. (B. E. and GROSE).—1.  A cat.

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  2.  (common).—The head; TO DROP ON ONE’S TIBBY = to take unawares.

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  c. 1866.  VANCE, The Chickaleary Cove.

        For to get me on the hop, or on my TIBBY drop,
  You must wake up very early in the mornin’.

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