big tiger; large tiger
Literal meaning: a physically large tiger. Not a common standalone word in modern Japanese; more often seen in names or fixed expressions.
I saw a big tiger at the zoo.
heavy drinker; staggering drunkard
Idiomatic expression for a person who drinks heavily and becomes very drunk. Often used humorously or critically.
He turns into a staggering drunkard when he drinks.
That heavy drinker was making a racket at the bar again last night.
Compound of 大 (big) and 虎 (tiger). The idiomatic sense likely derives from the image of a fierce, uncontrollable tiger to describe a person who becomes wild when drunk.