Definitions
1.Verbpresent participle and gerund of rat"Don't go ratting to the police about what happened."
2.NounThe blood sport of setting a dog upon rats confined in a pit to see how many he will kill in a given time.
3.NounA vocation involving the pest control of rats, typically using a working terrier.
4.NounDesertion of one's principles.
5.NounWorking as a scab, against trade union policies.