[krawl-speys] 
| (in a building) an area accessible by crawling, having a clearance less than human height, for access to plumbing or wiring, storage, etc. |
| crawl·space or crawl space (krôl'spās) n. A low or narrow space, such as one beneath the upper or lower story of a building, that gives workers access to plumbing or wiring equipment. |
