1That falls down or collapses; (of a building) ruinous.
2informal (originally and chiefly US). Designating an extremely drunk person or extreme drunkenness or drinking of alcohol.
(originally and chiefly US). To a degree that causes a person to fall down; extremely. Especially in "falling-down drunk".
Late Middle English; earliest use found in The Wycliffite Bible (early version). From falling + down after to fall down.