A small spring, pool, or other spot where liquid from the ground (e.g. water, petroleum or tar) has oozed to the surface; a place of seeping.
To ooze or pass slowly through pores or other small openings, and in overly small quantities; said of liquids, etc.
Seep is a variant of sipe that traces its roots to Middle English sipen and Old English sipian. It ultimately comes from a Proto-Indo-European root meaning "to pour out, drip, or trickle."