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crawlspace

or crawl space

[krawl-speys]
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noun
  1. (in a building) an area accessible by crawling, having a clearance less than human height, for access to plumbing or wiring, storage, etc.

Origin of crawlspace

First recorded in 1950–55; crawl1 + space
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018