the tendency of an electric conductor or stream of charged particles to constrict, caused by the action of a magnetic field that is produced by a flow of electricity.
Origin of pinch effect
First recorded in 1905–10
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019
the constriction of a beam of charged particles, caused by a force on each particle due to its motion in the magnetic field generated by the movement of the other particles
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012