gimlet eye

from The Collaborative International Dictionary of English v.0.48

Gimlet \Gim"let\, n. [Also written and pronounced {gimbled}]
   [OF. guimbelet, guibelet, F. gibelet, prob. fr. OD. wimpel,
   weme, a bore, wemelen to bore, to wimble. See {Wimble}, n.]
   A small tool for boring holes. It has a leading screw, a
   grooved body, and a cross handle.
   [1913 Webster]

   {Gimlet eye}, a squint-eye. [Colloq.] --Wright.
      [1913 Webster]