look as if you have seen a ghost
look as if (one) has seen a ghost
To look terrified, shocked, or pale from fright. What's wrong, Daniel? You look as if you've seen a ghost! The test was so nerve-racking that I came away looking as if I had seen a ghost.
Farlex Dictionary of Idioms. © 2015 Farlex, Inc, all rights reserved.
look as if you have seen a ghostlook very pale and shocked.
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