Definition of manures:
(n) :
Animal excrement, especially that of common domestic farm animals and when used as fertilizer. Generally speaking, from cows, horses, sheep, pigs and chickens.
(n) :
(by extension) Any fertilizing substance, whether of animal origin or not; fertiliser.
(v) :
To apply manure (as fertilizer or soil improver).
(n) :
(euphemistic) Rubbish; nonsense; bullshit.
(v) :
(archaic, literary) To cultivate by manual labor; to till; hence, to develop by culture.