The Collaborative International Dictionary of English v.0.48:

Balker \Balk"er\, n. [See 2d Balk.]
   One who, or that which, balks.
   [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Balker \Balk"er\, n. [See last Balk.]
   A person who stands on a rock or eminence to espy the shoals
   of herring, etc., and to give notice to the men in boats
   which way they pass; a conder; a huer.
   [1913 Webster]

WordNet (r) 3.0 (2006):

balker
    n 1: a person who refuses to comply [syn: balker, baulker,
         noncompliant]