keep your hair on

idiom

Definition of keep your hair on

British, informal
used to tell someone not to become too excited or upset Keep your hair on. We'll get there on time.

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“Keep your hair on.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/keep%20your%20hair%20on. Accessed 14 May. 2021.

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