(in a building) an area accessible by crawling, having a clearance less than human height, for access to plumbing or wiring, storage, etc.
Also, crawl space.

1950–55; crawl1 + space Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
Cite This Source Link To crawlspace
Example sentences
Today, the crawlspace is an active archaeological dig, and artifacts are on
  display for visitors to view.
Crawlspace foundation walls may be concrete, but are usually constructed of
  concrete masonry.
Pooled water under plastic sheeting used in crawlspace.
If the crawlspace is vented, the floor should be insulated and any pipes or
  ducts in the crawlspace should be insulated as well.
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