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on pain of

on pain of idiom

Also, under pain of. Subject to the penalty of a specific punishment. For example, The air traffic controllers knew that going on strike was on pain of losing their jobs. At one time this idiom often invoked death as the penalty, a usage that is largely hyperbolic today, as in We'd better be back on time, under pain of death. [Late 1300s]

The American Heritage® Dictionary of Idioms by Christine Ammer. Copyright © 2003, 1997 by The Christine Ammer 1992 Trust. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.