From Longman Dictionary of Contemporary Englishhighballhigh‧ball /ˈhaɪbɔːl $ -bɒːl/ noun [countable] especially American EnglishDFD an alcoholic drink, especially whisky or brandy mixed with water or soda
Examples from the Corpus
highball• He rushed over and slapped me on the back as I lifted a highball to my lips.• At home I made my absurd confession to Barbara, weeping at the dinner table, crying in my highball. 