A highball: a cocktail of whisky mixed with soda. In Japan it's a common drink at izakaya and bars, known for its refreshing taste.
暑い日は冷たいハイボールがよく合う。
A cold highball goes well on hot days.
居酒屋でまずハイボールを一杯頼んだ。
I ordered a highball first at the izakaya.
ウイスキーの種類を変えると、ハイボールの風味も大きく変わる。
Changing the type of whisky greatly alters the flavor of the highball.