also: さとう
noun
drinker; person fond of alcohol
Colloquial term for someone who loves drinking, often used in casual conversation.
See also: 右党
彼は大の左党で、毎晩のように飲みに行く。
He's a big drinker and goes out drinking almost every night.
noun
left-wing party
Only with reading さとう
Refers to a political party with left-wing ideology; the reading さとう is specifically used for this sense.
See also: 右党
その左党は福祉政策の拡充を掲げている。
That left-wing party advocates for the expansion of welfare policies.
右党 means 'right-wing party' or, in casual use, 'a person who prefers the right hand' or 'a teetotaler' (opposite of 左党 in the drinking sense).
Compound of 左 (left) and 党 (party, faction). The 'drinker' sense likely comes from the idea of raising a sake cup with the left hand, or from a historical association of left-leaning groups with drinking culture.