A sense of fear, foreboding, disgust or distaste
"Walking past a graveyard? On a lousy date? A lousy date who took you for a stroll in a graveyard? You might develop a case of the “willies,” a euphemism for being unsettled, frightened, or otherwise disturbed."
—Mental FLoss
I will show you fear in a handful of moths. it has nothing to do with penises.
The ballet Giselle was inspired by the Willis, a figure in Slavic folklore embodied by a married woman who perishes before her wedding day. At midnight, the women exit the spirit world to dance for their own pleasure; any man who sees them will die. Famous Italian composer Giacomo Puccini later adapted the story for his La Villi in 1884. This may be the origin of the statement that something gives you the willies. No-one is quite certain, as is often the
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