From Longman Business Dictionary
prohibitpro·hib·it /prəˈhɪbətproʊ-/ verb [transitiveT]LAW to officially stop someone doing something by making it illegal or against the rulesThe firm’s own internal rules now prohibit that type of loan.
prohibit somebody from doing somethingregulations prohibiting companies from promoting their shares immediately after an offering
—prohibition noun [countableC, uncountableU]the prohibition of cigarette advertising on television