Question

mare’s nest The new technology turned out to be a mare’s nest.

Accepted Answer

This idiom refers to a much vaunted discovery, which later turns out to be illusory or worthless.

Phrase/Idiom	mare’s nest
Definition	This idiom refers to a much vaunted discovery, which later turns out to be illusory or worthless.
Example	The new technology turned out to be a mare’s nest.

Mare’s Nest Idiom Refers Vaunted Discovery Turns Illusory