Third-person singular simple present indicative form of underprop.(verb)
Wiktionary.org : Text is available under the Creative Commons Attribution-ShareAlike License
Use "underprops" in a sentence
"He recognised it as she spoke and was content, for the proud generosity of his nature was built on a humility that had no underprops of petty pride."
"They are the underpinnings, the underprops of an old system, these _émigrés_, by which the masses were expected to toil for the benefit of the classes."