premise: to go in <mask> (or in <mask>s) with a person
hypothesis: the best context for <mask> here is Partnership; league; .  Usually used in the plural, and in modern usage often used to imply that the joint effort is unethical, shady, questionable, or illegal; but not An order of gastropods, including the true limpets, and having the teeth on the odontophore or lingual ribbon..