rotten egg
see under bad egg.
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The American Heritage® Idioms Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.
Examples from the Web for rotten egg
Historical Examples
The explosive contact gave forth a blast of sputtering sparks and an offensive, rotten-egg smell.
The Spell of the RockiesEnos A. Mills