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.

Examples from the web for tooth fairy

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.

Idioms and Phrases with tooth fairy

tooth fairy

A mythical source of bounty, as in So who will finance this venture—the 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.