The Collaborative International Dictionary of English v.0.48:

Shirr \Shirr\, n. (Sewing)
   A series of close parallel runnings which are drawn up so as
   to make the material between them set full by gatherings; --
   called also shirring, and gauging.
   [1913 Webster]

WordNet (r) 3.0 (2006):

shirr
    v 1: bake (eggs) in their shells until they are set; "shirr the
         eggs"