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highball (n.)

type of alcoholic drink, 1898, probably from ball "drink of whiskey;" high (adj.) because it is served in a tall glass. The word also was in use around the same time as railway jargon for the signal to proceed (originally by lifting a ball).

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Definitions of highball from WordNet

highball (n.)
a mixed drink made of alcoholic liquor mixed with water or a carbonated beverage and served in a tall glass;
From wordnet.princeton.edu