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Definition of Underproof
1. a. Containing less alcohol than proof spirit. See Proof spirit, under Spirit.
2. a. Containing less alcohol than proof spirit. See Proof spirit, under Spirit.
Definition of Underproof
1. Adjective. Having a lower alcohol content than proof spirit. ¹
¹ Source: wiktionary.com
Definition of Underproof
1. [adj]