I doubt she’s going to pop out of hiding after all these years.”
The expression is "out of hiding". "Pop" is not part of it. You can come out of hiding, and you can draw, force, flush, etc.
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The expression is "out of hiding". "Pop" is not part of it. You can come out of hiding, and you can draw, force, flush, etc. someone out of hiding. Who comes out of hiding has been revealed against her will. She was "in hiding", meaning "staying hidden". "Pop" is just a colorful word implying that the emergence would be sudden.