Definition from macmillandictionary.com
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I was afraid that you’d miss the flight.
He’s afraid of the dark.
I was afraid of getting lost.
If you don’t know the answer, don’t be afraid to say so.
Don’t be afraid – I won’t hurt you.
Everyone seems to be afraid of her.
He’s afraid of flying.
She was afraid to go near the dog.
People here are afraid for their children.