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Definition of rat-mole:
(n) :
(zoology) A medium-sized rodent belonging to the genus Rattus.
(n) :
(informal) Any of the numerous members of several rodent families (e.g. voles and mice) that resemble true rats in appearance, usually having short limbs, a pointy snout, a long, hairless tail, and a body length greater than about 12 cm, or 5 inches.
(n) :
(informal) A person who is known for betrayal.
(n) :
(informal) An informant or snitch.
(n) :
(informal) A scab: a worker who acts against trade union policies.
(v) :
(intransitive) To betray a political party, cause or principle; to betray someone, to desert a person or thing.