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become of (someone)
Happen to. I haven't seen my childhood best friend in years. I wonder what became of her.
become of someone or something
to happen or occur to someone or something. Whatever became of Joe and his friends? I don't know what became of my other plaid sock.
Happen to, befall, be the fate of, as in I haven't seen Joe in a year; what has become of his book? The King James Bible has this idiom (Genesis 37:20): "We shall see what will become of his dreams." [Late 1500s]
To happen to someone or something; be the fate of someone or something: Nobody really knows what became of the coach after he retired. What has become of the old garden?