n. a hand signal meaning okay. (The tip of the index or middle finger touches the tip of the thumb, and the hand is raised into the air.) : Give me a “high sign” when you want me to start.
Dictionary of American Slang and Colloquial Expressions by Richard A. Spears.Fourth Edition. Copyright 2007. Published by McGraw Hill.
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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]
