- (of a spirit) containing less than 57.1 per cent alcohol by volume
WordReference Random House Unabridged Dictionary of American English © 2026
un•der•proof
(un′dər pro̅o̅f′),USA pronunciation adj.
- Winecontaining a smaller proportion of alcohol than proof spirit.
- under- + proof 1855–60
Collins Concise English Dictionary © HarperCollins Publishers::
underproof /ˌʌndəˈpruːf/ adj
'underproof' also found in these entries (note: many are not synonyms or translations):