Source : Webster's Revised Unabridged Dictionary (1913)

Sleek \Sleek\, v. t. [imp. & p. p. {Sleeked};p. pr. & vb. n.
   {Sleeking}.]
   To make even and smooth; to render smooth, soft, and glossy;
   to smooth over.

         Sleeking her soft alluring locks.        --Milton.

         Gentle, my lord, sleek o'er your rugged looks. --Shak.