Any one of various species of small carnivores belonging to the genus Putorius, as the ermine and ferret. They have a slender, elongated body, and are noted for the quickness of their movements and for their bloodthirsty habit in destroying poultry, rats, etc. The ermine and some other species are brown in summer, and turn white in winter; others are brown at all seasons.
- Any of various carnivorous mammals of the genus Mustela, having a long slender body, a long tail, short legs, and brownish fur that in many species turns white in winter.
- A person regarded as sneaky or treacherous.
- To be evasive; equivocate.
- weasel out Informal To back out of a situation or commitment in a sneaky or cowardly manner.