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1. To open something very quickly or forcefully. A noun or pronoun can be used between "throw" and "open." His parents threw open his bedroom door when they smelled marijuana smoke coming from the basement. We threw open the chest, expecting to see treasure and riches beyond our wildest dreams.
2. To make something accessible to a wide range of people. A noun or pronoun can be used between "throw" and "open." In the interest of a free and fair trial, the state has thrown the case open to the public. For the first time in its history, the exclusive club has thrown open its membership to women.
Make more accessible, especially suddenly or dramatically, as in His withdrawal threw open the nomination to all comers. [Mid-1800s]
To make more accessible, especially suddenly or dramatically: The director threw open the door and walked in. After years of meeting with the city council in private, the mayor threw the meetings open to the public.