Verb
drain away (third-person singular simple present drains away, present participle draining away, simple past and past participle drained away)
To diminish over time; to disappear or leak out gradually.
A shallow layer of cold air left behind from our recent cold snap will gradually drain away from the higher terrain today. Source: Internet
Another curious feature of Rosewell discovered by volunteers is a vaulted brick drainage device with a flat or squared-off bottom that encircles the ruins, originally intended to drain away rain water. Source: Internet
Our big cities have expanded rapidly—we’ve paved over land that helped to drain away water and overloaded storm drain systems that were built back in the 1950s and ‘60s. Source: Internet
Floodwaters will take some time to drain away however falls are expected to top 5-15mm over the weekend, the Bureau of Meteorology says. Source: Internet