hard stop
n.— «If, as suggested, the strategy was to arrest anyone emerging from the Tulse Hill address as soon as possible and the Gold Commander instructed that the target was not to be allowed to enter the Tube, why did the eventual “hard stop”, as it is known, take place underground?…What decision-making process led to the fatal shooting if, as claimed, one officer had pinned Mr de Menezes in his seat?» —“Power struggle over Tube inquiry?” by Jon Silverman BBC News (U.K.) Aug. 18, 2005. (source: Double-Tongued Dictionary)