in league with
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.
Words nearby in league with
in itself,
in keeping with,
in key,
in kind,
in large measure,
in league with,
in left field,
in lieu of,
in light of,
in limbo,
in limine