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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.
*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.
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]
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.