in league with

Idioms  

1. Also, in cahoots with. In close cooperation or in partnership with, often secretly or in a conspiracy. For example, “For anybody on the road might be a robber, or in league with robbers” (Charles Dickens, A Tale of Two Cities, 1859), or We suspect that the mayor is in cahoots with the construction industry. The first term dates from the mid-1500s. The variant, a colloquialism dating from the early 1800s, may come from the French cahute, “a small hut or cabin,” and may allude to the close quarters in such a dwelling.

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Example Sentences

"They suspect them of being in league with the Malian army, which is why there were these reprisals," added the other man, dressed in a green boubou robe and traditional turban.

From Barron's

"Someone would search for the devil's mark to prove they were in league with Satan - that could be something like a mole or a birthmark. So by the time they were executed they looked the typical stereotype of a Halloween witch."

From BBC

A popular 1957 movie by the Egyptian director Salah Abu Seif depicted the “profiteering wholesalers” who, in league with corrupt government higher-ups, controlled tomato supplies at Cairo’s Rawd al-Farag market.

From The Wall Street Journal

It’s nothing but buck-passing middlemen in league with penny-pinching hospital executives.

From The Wall Street Journal

Not once did I suspect him of being in league with the devil, though he did wear a lot of black.

From The Wall Street Journal