tip one's hand
Accidentally reveal one's intentions, as in He avoided any comments on birthdays for fear of tipping his hand about the surprise party. This idiom probably alludes to holding one's hand in such a way that others can see the cards one is holding. [Colloquial; early 1900s]
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Words nearby tip one's hand
tipcat, tipi, tip-in, tipoff, tip of the iceberg, tip one's hand, Tippecanoe, Tippecanoe and Tyler too, tippee, tipper, Tipperary
The American Heritage® Idioms Dictionary
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