countershock

plural countershocks

1. A shock that travels in the opposite direction to an applied impulse.
   1. Such a shock that propagates through an object that was struck with a blow, such as a stone being chiseled or the Earth's crust undergoing an earthquake.

      This kind of break by countershock in the haft occurs on Paleoindian bifacial point and has been reproduced experimentally on replicas of Paleoindian and Solutrean shouldered points [63 ].

      2015 July 11, “The Still Bay and Howiesons Poort at Sibudu and Blombos: Understanding Middle Stone Age Technologies”, in PLOS ONE, →DOI

   2. Such a shock in the form of an electric impulse, as may occur for various reasons in electrical systems, for either desirable or unanticipated reasons (for example, some defibrillation involves countershocks).