air slake
/ˈɛrˌsleɪk/
verb
- To cause (lime) to become a powder by exposing it to air, or to undergo this process.
- The old pile of lime had air-slaked naturally after years of exposure to the weather.
- The workers air-slaked the quicklime by leaving it in open bins for several days.
- If you air-slake lime improperly, it may not be suitable for making mortar.