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underproof

American  
[uhn-der-proof] / ˈʌn dərˈpruf /

adjective

  1. containing a smaller proportion of alcohol than proof spirit.

underproof British  
/ ˌʌndəˈpruːf /

adjective

  1. (of a spirit) containing less than 57.1 per cent alcohol by volume

"Collins English Dictionary — Complete & Unabridged" 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Etymology

Origin of underproof

First recorded in 1855–60; under- + proof

Example Sentences

Examples are provided to illustrate real-world usage of words in context. Any opinions expressed do not reflect the views of Dictionary.com.

The Excise rule is as follows:— To reduce from any given strength to any required strength, add the overproof per centage to 100, or subtract the underproof per centage from 100.

From The Art of Perfumery And Methods of Obtaining the Odors of Plants by Piesse, George William Septimus

Definitions and idiom definitions from Dictionary.com Unabridged, based on the Random House Unabridged Dictionary, © Random House, Inc. 2023

Idioms from The American Heritage® Idioms Dictionary copyright © 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.