Definitions

from The American Heritage® Dictionary of the English Language, 4th Edition

  • adj. Having a smaller proportion of alcohol than proof spirit.

from Wiktionary, Creative Commons Attribution/Share-Alike License

  • adj. Having a lower alcohol content than proof spirit.

from the GNU version of the Collaborative International Dictionary of English

  • adj. Containing less alcohol than proof spirit. See Proof spirit, under spirit.

from The Century Dictionary and Cyclopedia

  • Having a greater specific gravity than 0.91984: applied to alcoholic liquors.

Etymologies

under- +‎ proof (Wiktionary)

Examples

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