Synonyms for under-pinning

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Roget's 21st Century Thesaurus, Third Edition Copyright © 2013 by the Philip Lief Group.

EXAMPLES FROM THE WEB FOR UNDER-PINNING

The shaft subsequently made on the Wapping shore was sunk to its full depth without any under-pinning.

He said it was a job for giants; clinging to the face of the precipice while you blew out and built on—under-pinning, isn't it?

And now he struck away the under-pinning of a few of the supports, so that the wagons could not be launched upon him by hand.