Let your hair down
Meaning
Relax and enjoy oneself.
Usage
Encourages people to be informal or carefree.
Origin & History
Origins and dates here are approximate summaries. Many idioms have disputed or unknown origins, and not every date has been checked against a historical dictionary, so treat specific dates and stories as a starting point rather than a citation.
Women in earlier times reserved letting their hair down for private moments.
19th-century etiquette references.