noun pl. weasels -·sels or weasel -·sel

1. 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
2. a sly, cunning, or sneaky person

Etymology: ME wesel < OE wesle, akin to Ger wiesel, prob. < IE base *weis-, to flow out (with reference to the rank odor emitted by the animal) > virus, bison

intransitive verb

1. to use weasel words
2. Informal to avoid or evade a commitment or responsibility: with out