from Wiktionary, Creative Commons Attribution/Share-Alike License
- v. To be a party to a secret shared by a small group of people.
Sorry, no etymologies found.
“We heard about it from Power, who asked us to be in on it,” said Dring.
The fat man was going to brace Dudley’s niece while he and Stompanato braced Chaz Minear, and when they had Coleman placed, he’d call his newspaper contacts so they could be in on the capture: first interviews with Captain Malcolm E. Considine, captor of the Wolverine Monster.
“Though I can’t claim to be in on the totalizations finalizationwise —”
"Me an 'the guys, Besen, all of us — we wanna be in on what happens."
Ed told Charles Flannigan, Rex, and myself that he had chosen Tommy to be in on the stunt because Tommy was so quiet that no one would suspect him of being an accomplice.
Dring and Robinson knew, but would not be in on it.