Leach \Leach\, v. t. [imp. & p. p. {Leached}; p. pr. & vb. n.
{Leaching}.] [Written also leech and letch.]
1. To remove the soluble constituents from by subjecting to
the action of percolating water or other liquid; as, to
leach ashes or coffee.
[1913 Webster]
2. To dissolve out; -- often used with out; as, to leach out
alkali from ashes.
[1913 Webster]