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put in mothballs

Defer indefinitely or for a very long time, as in We've put the plans for a new library in mothballs. This expression alludes to storing woolen clothing or other items with marble-size balls of naphthalene or camphor to prevent them from being damaged by moths. [1940s]

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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.