also HOP-ME-THUMB, HOPTHUMB
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in 16th century, hop on my thombe, from hop (vb.),
applied to a person so small that he may be hyperbolically told to hop on one's thumb
From: The History of English Poetry
From the Eleventh to the Seventeenth Century.
By Thomas Warton.
A Full Reprint - Text and Notes - of Edition London 1778 & 1781
Translation of Virgil by Robert Stanyhurst.