To wash with cow-dung and water.
Anglo-Indian, from Urdu (Hindi) lipna.
1895 - Kipling, Second Jungle Book, page 80: The big wicker~chest, leeped with cow-dung.
When I first came across this word, I thought that the OED had a different definition to the term wash than I had. I was distressed to find, looking up wash, that they have the same idea of what wash means that I do. I vowed that I would never allow myself to find out nice my work shirts would be if I decided to leep them instead of the more modern way of cleaning them.