110 proof en · ADV
Etymology
See proof. Most hard liquor sold at retail in the United States is between 80 and 95 proof (40 to 47.5% by volume); higher proof alcohol is usually bootlegged.
Meanings
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(not-comparable) Intensely; strongly.
The crowd which jams the grandstands... constitutes the most informal assemblage in the world. This crowd is 110 proof democratic and unconventional. Judge, subway guard, doctor, banker,..., laborer—they can all sit in the same row....
1920 April 11, “Baseball Park, a Stronghold of Free Speech”, in The New York Times: