- tarnish (v.)
- 1598, from prp. stem of M.Fr. ternir "dull the luster or brightness of, make dim" (15c.), probably from O.Fr. adj. terne "dull, dark," from a Frank. source cognate with O.H.G. tarnjan "to conceal, hide," O.E. dyrnan "to hide, darken," from P.Gmc. *darnijaz, related to dark. Figurative sense is from 1697. The noun is recorded from 1713.