Have a wandering eye

Meaning

To be attracted to or look admiringly at people other than one's committed partner, often implying a tendency towards unfaithfulness.

Origin

Imagine a person in a room, ostensibly engaged with one individual, yet their gaze constantly drifts—darting to other faces, lingering a moment too long on passersby. This restless, unfixed glance, unable to settle, is the literal embodiment of the 'wandering eye'. The phrase itself brilliantly encapsulates this physical betrayal, transforming a simple physiological action into a powerful metaphor for disloyalty or temptation in relationships. It suggests an underlying restlessness of spirit, a visual restlessness that hints at deeper desires, long before any action is taken. The eyes, famously windows to the soul, here reveal a soul unwilling to be confined to a single view.

Examples

After noticing him constantly glancing at other women, she realized he might have a wandering eye.
Despite being married, his reputation for having a wandering eye often made his wife feel insecure.