Definitions
1.verb(usually with “on” or “out”) To betray a person or party, especially by telling their secret to an authority or an enemy; to turn someone in."He is going to rat us out!"
2.verbTo work as a scab, going against trade union policies.
3.verb(of a dog, etc.) To kill rats.
4.verbTo scratch or score."He ratted a vertical line on his face with a pocket knife."
5.verbTo tear, rip, rend."Ratted to shreds."
6.verbDamn, drat, blast; used in oaths.
7.nounThe blood sport of setting a dog upon rats confined in a pit to see how many he will kill in a given time.
8.nounA vocation involving the pest control of rats, typically using a working terrier.
9.nounDesertion of one's principles.
10.nounWorking as a scab, against trade union policies.