Slough (?), n. [OE. slogh, slough, AS. slōh a hollow place; cf. MHG. slūch an abyss, gullet, G. schlucken to swallow; also Gael. & Ir. sloc a pit, pool. ditch, Ir. slug to swallow. Gr. ����� to hiccough, to sob.] 1. A place of deep mud or mire; a hole full of mire. Chaucer.
He's here stuck in a slough. Milton.
2. [Pronounced slo͞o.] A wet place; a swale; a side channel or inlet from a river. [In this sense local or provincial; also spelt sloo, and slue.]
Slough grass(Bot.), a name in the Mississippi valley for grasses of the genus Muhlenbergia; — called also drop seed, and nimble Will.