Glossary entry (derived from question below)
English term or phrase:
let one\'s hair down
Arabic translation:
أطلق لنفسه العنان
English term
Egypt
Professional top quality translation
Native in: Arabic 
, English
Works in: English to Arabic, Arabic to English, Arabic, and 1 more.
let one's hair down
| 4 +1 | أطلق لنفسه العنان |
Myrtrad1
|
| 5 | تسدل شعرها |
Liliane Hatem
|
| 4 +1 | تتحرر من التقاليد والقيود |
Nadia Ayoub
|
| 5 | يسترخي / يدعه من القلق والتوتر |
Noha Kamal, PhD.
|
May 10, 2010 18:39: Mohamed Kamel changed "Language pair" from "Arabic to English" to "English to Arabic"
Proposed translations
أطلق لنفسه العنان
Lebanon
Fast and reliable
Native in: English , Arabic
Works in: English to Arabic, Arabic to English, Arabic to French, and 3 more.
تسدل شعرها
Egypt
Never lost for words!
Native in: Arabic
Works in: English to Arabic, Arabic to English, Italian to Arabic, and 4 more.
تتحرر من التقاليد والقيود
To drop one's reserve or inhibitions.
http://www.thefreedictionary.com/let (one's) hair down
Meaning
Behave in a free or uninhibited manner.
Origin
Letting one's hair down was a commonplace part of women's daily activities in the 17th century. The hair was normally pinned up and was let down for brushing or washing. The term used for this at the time was dishevelling. Anyone who is unkempt and generally untidy might now be described as dishevelled but then it applied specifically to hair which was unpinned. The first reference I can find which refers specifically to this is John Cotgrave's, The English treasury of wit and language, 1655:
http://www.phrases.org.uk/meanings/228000.html
Quality stands out...
Native in: Arabic
Works in: English to Arabic, Arabic to English, French to Arabic, and 1 more.
يسترخي / يدعه من القلق والتوتر
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Note added at 17 mins (2010-05-10 15:42:35 GMT)
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http://www.usingenglish.com/reference/idioms/let your hair d...
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