From fall, falling away, falling off, etc. See to fall away, to fall off, etc, under fall, falling band, the plain, broad, linen collar turning down over the doublet, worn in the early part of the 17th century.
(Science: medicine) falling sickness see shooting star. Falling stone, a stone falling through the atmosphere; a meteorite; an aerolite. Falling tide, the ebb tide. Falling weather, a rainy season.