time bomb

time bomb idiom
A situation that threatens to have disastrous consequences at some future time, as in That departmental dispute is a time bomb just waiting to go off. This term alludes to an explosive device that is set to go off at a specific time. [First half of 1900s]

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.

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