"ratted" in the verb sense
1. rat
desert one's party or group of friends, for example, for one's personal advantage
2. rat
employ scabs or strike breakers in
3. fink, scab, rat, blackleg
take the place of work of someone on strike
4. rat
give (hair) the appearance of being fuller by using a rat
5. rat
catch rats, especially with dogs
6. denounce, tell on, betray, give away, rat, grass, shit, shop, snitch, stag
give away information about somebody
"He told on his classmate who had cheated on the exam"
Source: WordNet® (An amazing lexical database of English)
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