put in mothballs

put in mothballs idiom
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]

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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