- a gesture, glance, or facial expression used as a surreptitious signal to warn, admonish, or inform.
Origin of high sign
Examples from the Web for high sign
Historical Examples of high sign
I come to you and give you the high-sign—and you throw me down.The Million-Dollar Suitcase
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]