Having two hearts, either literally or figuratively meaning being deceitful or divided in loyalty and sincerity.
Combination of 'double' and 'hearted.' The metaphorical sense comes from medieval and Renaissance literature where a 'double heart' symbolized hypocrisy or conflicting emotions and loyalties.
Poets and writers loved calling dishonest people 'double-hearted' because they imagined one heart for their public self and another secret one—it's a vivid way to describe someone who pretends to be something they're not.
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