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I wonder why they're as white as sheets.

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WowenglishI wonder why they're as white as sheets.
To be white as a sheet is to be extremely frightened or shocked. The children find the taste of onions so repulsive that they are shocked to hear that they may come to like onions as they grow older.

CJ
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Sheets are traditionally white. When someone's skin is white, we think that they're sick or really scared.

Emotion: wink

Jeremy
 CalifJim's reply was promoted to an answer.