
Be frightened/nervous/scared of your own shadow
Overstated Fear
The phrase exaggerates someone's fear to show they are scared of even silly things.

You jump at every noise; you're scared of your own shadow!
Not Literal
It is a metaphorical expression, not meaning fear of an actual shadow.

Even though it was just a movie, she's now so nervous of her own shadow.
Emotional State
It implies a temporary or situational state of fear, not a permanent trait.

After hearing that story, he's currently frightened of his own shadow.
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