Definition of "open up" [open up]

• To open. (verb)
• To reveal oneself; to become communicative. (verb)
• To commence firing weapons. (verb)

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• "He won election to the board of the Council on Foreign Relations by exploiting a new nomination-by-petition procedure designed to open up that old boy organizationone that had been recommended, interestingly, by a Council committee headed by Cyrus Vance."
• "Once the bunker was sealed, it would open up only once more: the next morning, when the three prion-emitting devices were ready and their bearers were sent off to LAX, Kennedy Airport, and Heathrow in London."
• "The Corsis as a rule never were ones to open up with conversation around the family dinner table, so typically it fell to Ulrika to pepper their talk with loaded questions or open-ended statements that no one dared avoid."