Definition of grog
1
: alcoholic liquor
especially
: liquor (such as rum) cut with water and now often served hot with lemon juice and sugar sometimes added
2
: refractory materials (such as crushed pottery and firebricks) used in the manufacture of refractory products (such as crucibles) to reduce shrinkage in drying and firing
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Merriam-Webster unabridged
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The first known use of grog was in 1756
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