Folie à deux
/fɒˈli ə ˈduː/
▷French for "madness of two" or shared psychosis.
▷A psychiatric syndrome in which symptoms of a delusional belief and hallucination are transmitted from one individual to another.
▷Usually happen only in long-term relationships in which the person who has the psychotic disorder is dominant and the other person is passive.
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Caution: contains slight gore, madness and dark themes.