Word Origin & History
tanlate O.E. tannian "to convert hide into leather" (by steeping it in tannin), from M.L. tannare "tan, dye, a tawny color" (c.900), from tannum "crushed oak bark," used in tanning leather, probably from a Celtic source (e.g. Breton tann "oak tree"). The meaning "make brown by exposure to the sun" first
recorded 1530. To tan (someone's) hide in the figurative sense is from 1670. The adj. tan "of the color of tanned leather" is recorded from 1665; the noun sense of "bronze color imparted to skin by exposure to sun" is from 1749; as a simple name for a brownish color, in any context, it is recorded from 1888.
tanner"sixpence," slang word first recorded 1811, of unknown origin. J.C. Hotten, lexicographer of Victorian slang, thinks it may be from tanner and skin, rhyming slang for "thin," presumably in reference to the smallness of the coin. (Not to be confused with tenner, slang for "ten pound note," which dates
from 1861.)