have a wild hair to (do something)

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have a wild hair to (do something)

To have an intense, and typically sudden, enthusiasm or zeal to do something. I don't know why Callie has a wild hair to tie-dye all of the sudden, but I did get a cute shirt out of it, so I can't complain.
See also: hair, have, wild
Farlex Dictionary of Idioms. © 2015 Farlex, Inc, all rights reserved.
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