means A state of uncertain waiting or in-between suspension where nothing is resolved — also the dance-game of bending backward to pass under a steadily lowering bar.

from Two threads twist together here. The 'in-between' sense comes from Latin 'limbus,' meaning an edge, hem, or border — the Church placed Limbo at the very rim of Hell, a borderland for souls neither saved nor damned. The dance is a separate, later arrival, traced to Trinidad in the West Indies, where 'limbo' is generally taken as a variant of 'limber,' meaning supple or loose-jointed — fitting for a body bending under that bar.