purpling
n.— «The man who called the school during an emotional crisis alleged that Soens would pinch his nipples, a practice called “purpling,” due to the dark bruises that appeared on the boys’ chests.» —“Probe of retired bishop began in ‘02, papers show” by Shirley Ragsdale Des Moines Register (Iowa) Feb. 8, 2006. (source: Double-Tongued Dictionary)