Definition of weasels:
(n) :
(informal, derogatory) A devious or sneaky person or animal.
(v) :
(transitive) To achieve by clever or devious means.
(v) :
(transitive or reflexive) To gain something for oneself by clever or devious means.
(v) :
(intransitive) To engage in clever or devious behavior.
(n) :
Any of the carnivorous mammals of the genera Mustela, Neogale, Poecilogale, and Lyncodon, having a slender body, a long tail and usually a light brown upper coat and light-coloured belly.
(n) :
Any of certain other species of the family Mustelidae.