keep your hair on

idiom

Definition of keep your hair on

British, informal
used to tell someone not to become too excited or upsetKeep 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 30 May. 2020.

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