folie à deux
A situation in which two people behave abnormally together in a way that neither of…A situation in which two people behave abnormally together in a way that neither of them would individually.
Meaning
2 sensesA situation in which two people behave abnormally together in a way that neither of them would individually.
A rare syndrome in which a symptom of psychosis (particularly a paranoid or delusional belief) is transmitted from one person to another.
Origin
Borrowed from French folie à deux (“madness for/of two [people]”).Borrowed from French folie à deux (“madness for/of two [people]”).
Wiktionary, CC BY-SA 4.0 · source
Dictionary text adapted from Wiktionary (Wiktionary contributors, CC BY-SA 4.0) and Open English WordNet / Princeton WordNet (CC BY 4.0, WordNet License); shared under CC BY-SA 4.0. Example sentences and recordings are credited where they appear.