1 - to appear after being hidden or not active for a long time, especially in order to do something unpleasant
2 - The phrase to crawl, or to come, out of the woodwork means, of an unpleasant or unwelcome person or thing, to come out of hiding, to emerge from obscurity.
Or
3 - To draw attention to something that had been hidden; to unexpectedly bring previously silent voices or concerns to the forefront.
This expression means to reveal information that was previously unknown or hidden. The fact that something emerges from seemingly nowhere ( woodwork ) is the focus on this phrase.
People often wait until they are granted permission—either explicitly or by the example of someone else doing it—to come out with new information; this could be because the ideas or information is unpopular.
