A sibilant exclamation that one should be silent(interjection)
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Use "hist" in a sentence
"A hissing noise was heard as if from a score of rattlesnakes, and now the cow-punchers emerged on all sides from the darkness, stepping high, with ludicrously exaggerated caution, and "hist" - ing to one another to observe the utmost prudence in approaching."
"Wimmen's clubs is all right so long as they stick to readin 'hist'ry and discussin' tattin ', but when they flock like a lot of old hen turkeys and go to peckin' a man because he's down and can't help himself, it ain't anything but persecution -- wolves turnin 'on another one that's got his leg broke."
"But the girls had not reached the living-room door before a "hist" halted them."