run up the flagpole
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run (something) up the flagpole
To test out an idea in order to gauge interest or gain feedback. Run your idea up the flagpole before you pitch it to the boss, so that you don't make a fool of yourself.
Farlex Dictionary of Idioms. © 2015 Farlex, Inc, all rights reserved.
run (something) up the flagpoleSlang
To test (a plan, suggestion, draft, or idea) and then measure the response to it.
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.