Source : Webster's Revised Unabridged Dictionary (1913)

Seep \Seep\, or Sipe \Sipe\, v. i. [AS. s[=i]pan to distill.]
   To run or soak through fine pores and interstices; to ooze.
   [Scot. & U. S.]

         Water seeps up through the sidewalks.    --G. W. Cable.

Source : WordNet®

seep
     v : pass gradually or leak through or as if through small
         openings [syn: {ooze}]