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think big

Be ambitious, as in There's no point in moving to a place the same size; we have to think big and plan for expansion. [Colloquial; mid-1900s]

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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.