What does "come to someone's aid" mean here?
This is an expression that means "to help someone." To "aid" someone means to "help" them, so when the speaker says "the unseen voice came to Psyche's aid," he means that the voice helped Psyche. Ex: I was having trouble lifting the heavy box, but a stranger came to my aid. Ex: There was a car accident on the road. Luckily, an ambulance quickly came to the driver's aid.
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