expression, godan verb (-su)
drain the pus; root out corruption; clean up
Idiomatic expression. Literally 'to drain out pus', used figuratively for forcing out corruption, misconduct, or bad elements from an organization or group. Often implies a thorough, sometimes painful, cleansing process.
See also: 膿
To root out the corruption in the organization, they dismissed all the executives who had committed misconduct.
この問題は、膿を出し切らないと再発するだろう。
This problem will likely recur unless we drain all the pus, so to speak.