I was told by an undisclosed source.
It is used when a person is trying to hide the source of his information
It indicates that the person knows something that is a secret and wants to withhold the identity of the person who let him know about it
A little bird has told me all about your journey to Serbia, Europe.
How do I know it’s my birthday? A little bird told me.
A little bird told me that you've got a new car.
There is no origin for this idiom
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definition
Common phrase that has a specific meaning.