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.
[Origin: 1900–05, Americanism; 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]
1902, of uncertain origin, possibly from Ger. Fink "a frivolous or dissolute person," originally "finch," which also gave it another sense of "informer" (cf. stool pigeon). The other theory traces it to Pinks, short for Pinkerton agents, the private police force hired to break up the 1892 Homestead strike.
![[P]](http://cache.lexico.com/g/d/premium_mh.gif){kind=small}
Audio Help [fingk] Pronunciation Key Slang. 
