the.com/bender

means An extended, often reckless stretch of heavy drinking (or similar indulgence) that goes on for days, usually at the expense of sleep, dignity, and plans.

from Rooted in 'bend,' which by the 1800s had picked up a slang sense of a wild spree or drinking bout — the idea being that someone 'on the bend' had bent away from their normal, upright, sober path. The term is chiefly British/Irish in origin before spreading, and by the late 19th century 'bender' was firmly established as slang for a drunken spree.