put money on
Also, put one's money on. Bet on; also, consider likely or nearly certain, expect. For example, Jean put her money on Contender but the horse came in last, or I'm sure the President will speak to the crowd; I'd put money on it. This idiom was first recorded in 1931.
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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.