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high sign

a gesture, glance, or facial expression used as a surreptitious signal to warn, admonish, or inform.
Origin of high sign
1900-05 Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2015.
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high sign

A secret signal intended to warn or inform, as in Dad gave us the high sign when it was time to leave. This expression presumably alludes to a gesture such as a hand wave. [ c. 1900 ]
The American Heritage® Idioms Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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