tooth fairy

noun
a fairy credited with leaving a child money or a small gift in exchange for a baby tooth that has fallen out and been placed under the child's pillow at night.
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Based on the Random House Dictionary, © Random House, Inc. 2014.
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American Heritage
Idioms & Phrases

tooth fairy

A mythical source of bounty, as in So who will finance this venturethe tooth fairy? This expression refers to the fairy credited with leaving money under a child's pillow in place of a baby tooth that has fallen out, a practice popular with American parents since the first half of the 1900s.

The American Heritage® Dictionary of Idioms by Christine Ammer.
Copyright © 1997. Published by Houghton Mifflin.
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Example sentences
To think that a relaxation of environmental and labor laws would even the field is to believe in the tooth fairy.
And the tooth fairy changes your teeth into quarters too.
They hear about everything from the tooth fairy to guardrails to chewing gum to dishwashing detergents.
Anybody who believes that, you know, believes in the tooth fairy.
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