Wiktionary
a. in cahoots (with)
WordNet
adj. (usually followed by `with') united in effort as if in a league; "they found out that some policemen were in league with the criminals" [syn: in league(p)]
Usage examples of "in league".
If he is in league with the brokers he may be looking for a chance to interview them, but he will be on his guard, knowing that we are here.
The merchants, and especially the Council, had always had a very healthy interest in the events that happened in and around the other cities-who was buying what, who was selling what, who was in league with whom, who was marching against whom-so the fishermen and the peasants had all known, for many years, that the Council of Pirogia, and some individual merchants, would pay well for information of all sorts.
Either he was in league with the Enemy, or the Arethousans were stranger than any folk she understood.
The elements were now no longer at war with the travelers, as on their journey across the Pampas -- air and water seemed in league to help them forward.
He could be an obsessed fan, or a lover of the maid's who'd been in league with her to burgle the Gannon residence.
She told herself it wasn't a good fitWilly Young and Max Gannon in league.
Peter said, wondering if all those on his side were in league to give him more time.
The brokers were Pelter, Japson Company, and it was not long before Dick and his brothers discovered that Pelter and Japson were in league with Josiah Crabtree.