'two-faced' originates from the English words 'two' and 'face,' where 'two' meant 'double' and 'face' referred to 'persona or appearance.'

'two-faced' evolved from the literal idea of having two faces, one for each persona, and became a metaphor for deceitfulness.

Initially, it meant 'having two faces,' but over time it evolved into its current meaning of 'deceptive or hypocritical.'