let your hair down

آرام بودن

آروم باش

ا ( مخصوصا بعد از کار زیاد ) ریلکس کردن ، استراحت کردن

نفس راحتی کشیدن

to behave in an uninhabited or relaxed manner.
to relax and enjoy oneself.
to allow yourself to behave much more freely than usual and enjoy it.

this idiom dates back to the 1600s, when women in the upper classes wore their hair in extremely elaborate, replete with feathers or flowers and towering two feet and more in height.
the idea of literally letting one's hair down persisted into the early 1900s, as women continued to grow their hair long and pin it up in public.
this changed in the 1920s when women began to bob their hair.
today, let one's hair down is an idiom and is seldom used literally.

استراحت کردن و خوش گذراندن
relax and enjoy yourself

To allow your self to enjoy eomething freely, with out worring about what other people think.
کاری که دوست داری را انجام بده

نفس راحتی کشیدن
استراحت کردن