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A hand gesture used to signal someone about something. Sometimes, it refers specifically to the "OK" gesture (when the tip of the index finger and thumb touch, forming a circle). I'll give you the high sign when it's time to come out on stage.
Farlex Dictionary of Idioms. © 2015 Farlex, Inc, all rights reserved.
*the high sign
Fig. a prearranged signal for going ahead with something. (Often refers to a hand signal or some other visual signal. *Typically: get ~; give someone ~.) When I got the high sign, I pulled cautiously out into the roadway. The train's engineer got the high sign and began to move the train out of the station.
McGraw-Hill Dictionary of American Idioms and Phrasal Verbs. © 2002 by The McGraw-Hill Companies, Inc.
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® Dictionary of Idioms by Christine Ammer. Copyright © 2003, 1997 by The Christine Ammer 1992 Trust. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
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.
McGraw-Hill's Dictionary of American Slang and Colloquial Expressions Copyright © 2006 by The McGraw-Hill Companies, Inc. All rights reserved.