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Idioms and Phrases with throw open

throw open

Make more accessible, especially suddenly or dramatically, as in His withdrawal threw open the nomination to all comers. [Mid-1800s]

The American Heritage® Idioms Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.