The Collaborative International Dictionary of English v.0.48:

Minish \Min"ish\, v. t. [OE. menusen, F. menuiser to make small,
   cut small, fr. (assumed) LL. minutiare, for minutare, fr. L.
   minutus small. See Minute, a., and cf. Diminish,
   Minge.]
   To diminish; to lessen.
   [1913 Webster]

         The living of poor men thereby minished. --Latimer.
   [1913 Webster]