high sign

noun

a gesture, glance, or facial expression used as a surreptitious signal to warn, admonish, or inform.

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Origin:
1900–05

Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2012.
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High sign is always a great word to know.

So is ninnyhammer. Does it mean:

an arrangement of five objects, as trees, in a square or rectangle, one at each corner and one in the middle.

a fool or simpleton; ninny.

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Slang Dictionary

high sign definition

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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American Heritage

Idioms & Phrases

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]

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Matching Quote

"So quickly we changed the civilizing sky of Chesuncook for the dark wood of the Caucomgomoc. On reaching the Indian's camping-ground, on the south side, where the bank was about a dozen feet high, I read on the trunk of a fir tree, blazed by an axe, an inscription in charcoal which had been left by him. It was surmounted by a drawing of a bear paddling a canoe, which he said was the sign which had been used by his family always. The drawing, though rude, could not be mistaken for anything but a bear, and he doubted my ability to copy it."

-Henry David Thoreau