Meaning of folie à deux

fo•lie à deux

Pronunciation: (fo-lē' u d' Fr. fô-lē a dœ'), [key]
— pl. fo•lies à deux
  1. the sharing of delusional ideas by two people who are closely associated.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.
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