noun
- a person who informs on others; an informer or tattletale
- a contemptible or untrustworthy person
Usage: slang
Usage: slang
Examples
- Nobody trusted him after he proved to be a ratfink.
- She called her brother a ratfink for telling their parents about the broken vase.
- The other students avoided the ratfink who always reported rule violations.
- He was labeled a ratfink for revealing the secret plan to the authorities.
- Don’t be such a ratfink and keep our conversation private.
- The ratfink couldn’t be trusted with any confidential information.