black aspirin
n.β Β«βDonβt you do that in front of the doctor!” he ordered the unconscious man, and I have little doubt that he would have kicked him hard and oftenβin short, given him what used to be called in prison wardersβ parlance “the black aspirin,” which is to say the prison warderβs bootβif I had turned my back for an instant.Β» ββThe Evils of Ideology” by Theodore Dalrymple FrontPage Mag. Sept. 6, 2006. (source: Double-Tongued Dictionary)