Source : Webster's Revised Unabridged Dictionary (1913)

Leak \Leak\, v. i. [imp. & p. p. {Leaked}; p. pr. & vb. n.
   {Leaking}.] [Akin to D. lekken, G. lecken, lechen, Icel.
   leka, Dan. l[ae]kke, Sw. l["a]cka, AS. leccan to wet,
   moisten. See {Leak}, n.]
   1. To let water or other fluid in or out through a hole,
      crevice, etc.; as, the cask leaks; the roof leaks; the
      boat leaks.

   2. To enter or escape, as a fluid, through a hole, crevice,
      etc.; to pass gradually into, or out of, something; --
      usually with in or out.

   {To leak out}, to be divulged gradually or clandestinely; to
      become public; as, the facts leaked out.