leach away(redirected from leach out)
[for something] to erode or wash away gradually by leaching. The soft sandstone leached away under the constant rains. The flowerpots sat out in the rain, where all the nutrients in the soil leached away.
leach something away (from something)and leach something out (of something); leach something out; leach something away
to remove something from something by leaching. The heavy rains leached nutrients away from the soil. The rains leached away the nutrients.