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open house, keep

Provide hospitality for visitors, as in They loved company and kept open house virtually all summer long. This usage differs from the plain open house, which refers to a particular occasion or period when a home or institution is open to visitors or prospective buyers. [First half of 1500s]

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