The Collaborative International Dictionary of English v.0.48:

Milksop \Milk"sop`\, n.
   A piece of bread sopped in milk; figuratively, an effeminate
   or weak-minded person. --Shak.
   [1913 Webster]

         To wed a milksop or a coward ape.        --Chaucer.
   [1913 Webster]

WordNet (r) 3.0 (2006):

milksop
    n 1: a timid man or boy considered childish or unassertive [syn:
         sissy, pantywaist, pansy, milksop, Milquetoast]