/fingk/ , Slang.
n.
1. a strikebreaker.
2. a labor spy.
3. an informer; stool pigeon.
4. a contemptible or thoroughly unattractive person.
v.i.
5. to inform to the police; squeal.
6. to act as a strikebreaker; scab.
7. fink out ,
a. to withdraw from or refuse to support a project, activity, scheme, etc.; renege: He said he'd lend me his motorcycle, but he finked out.
b. to become untrustworthy.
[ 1900-05, Amer.; compared with G Fink lit., FINCH, colloquial epithet for an undesirable person, esp. an untidy or loose-living one (often in compounds, as Duckfink sycophant, Schmierfink untidy writer); but the transmission of this word to E and the range of meanings of the E word have not been clarified fully ]