Real Dictionary

weasel
countable noun: A weasel is a small wild animal with a long thin body, a tail, short legs, and reddish-brown fur.

weasel in American English
any of various agile musteline carnivores (esp. genus Mustela) with a long, slender body, short legs, and a long, bushy tail: they feed on rats, mice, birds, eggs, etc. and are worldwide
to use weasel words

weasel in American Englishesp collectively
intransitive verb: to evade an obligation, duty, or the like; renege
noun: any small carnivore of the genus Mustela, of the family Mustelidae, having a long, slender body and feeding chiefly on small rodents

weasel in British English
noun: any of various small predatory musteline mammals of the genus Mustela and related genera, esp M. nivalis (European weasel), having reddish-brown fur, an elongated body and neck, and short legs