What is "nimble will"

Slough \Slough\, n. [OE. slogh, slough, AS. sl[=o]h a hollow place; cf. MHG. sl[=u]ch 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 sl[=oo].] A wet place; a swale; a side channel or inlet from a river.

   Note: [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.

n. A slender branching American grass ((taxlink Muhlenbergia diffusa species noshow=1), now (taxlink Muhlenbergia sylvatica species noshow=1) or (taxlink Muhlenbergia schreberi species noshow=1)) of some repute for grazing purposes in the Mississippi valley.

n. slender branching American grass of some value for grazing in central United States [syn: nimblewill, Muhlenbergia schreberi]