"This is the leach," said Kitty, pointing to a large, yellowish, upright wooden cylinder, which rested on some slanting boards, down the surface of which ran a brownish liquid that dripped into a trough.

1670, Hannah Woolley, “To make Leach and to colour it”, in The Queen-like Closet, Or, Rich Cabinet:

Heavy rainfall can leach out minerals important for plant growth from the soil.

[T]he very wet winter will have washed much of the goodness out of the soil. Homemade compost and the load of manure we get from a friendly farmer may not be enough to compensate for what has leached from the ground.

The gangue was leached to recover minerals left behind by the original technology.

A more generic geography, one where the suburb uneasily abuts the commercial and industrial, or leaches out to a nonurban frontier.

Leach

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