The Dictionary of American Slang, Fourth Edition by Barbara Ann Kipfer, PhD. and Robert L. Chapman, Ph.D. Copyright (C) 2007 by HarperCollins Publishers. Cite This Source
Idioms and Phrases with out of the woodwork
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.
[ ; mid-1900s