Emerging from obscurity or a place of seclusion. It often is put as come (or crawl) out of the woodwork, as in The candidates for this job were coming out of the woodwork. The expression alludes to insects crawling out of the interior wooden fittings of a house, such as baseboards and moldings. [Colloquial; mid-1900s]
The American Heritage® Idioms Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.