TELL A SECRETto tell the police, a teacher, or a parent that someone has broken a rule or a law 告发,告密SYN squeal on somebody
Examples from the Corpus
fink• Once yer know the date an' time o' the job yer can fink back.• Mind you though, I fink it was the pipe what did it.• Besides, I fink they do a good job.• I fink they've got rid o' that chaff-cutter.
Originfink1
(1800-1900) Perhaps from German, “finch, student not belonging to a student association”