The Collaborative International Dictionary
Rum shrub
Rum \Rum\, n. [probably shortened from Prov. E. rumbullion a great tumult, formerly applied in the island of Barbadoes to an intoxicating liquor.] A kind of intoxicating liquor distilled from cane juice, or from the scummings of the boiled juice, or from treacle or molasses, or from the lees of former distillations. Also, sometimes used colloquially as a generic or a collective name for intoxicating liquor.
Rum bud, a grog blossom. [Colloq.]
Rum shrub, a drink composed of rum, water, sugar, and lime juice or lemon juice, with some flavoring extract.