Pronunciation: [lˈɛtɪd hˈe͡ə dˈa͡ʊn] (IPA) 
The correct spelling for the phrase "letted hair down" is actually "let down hair." The use of the past tense verb "letted" is outdated and no longer considered standard English. The correct pronunciation is /lɛt daʊn hɛr/, with emphasis on the first syllable of "let" and the second syllable of "down." The sound represented by "aʊ" is a diphthong, blending the sounds of "ah" and "oo."
"Letting one's hair down" is an idiomatic expression that refers to letting go of inhibitions, relaxing, or behaving in a less restrained or formal manner. This phrase originated from the literal act of undoing one's hair, which has often been associated with a more casual or carefree state.
Primarily used in social contexts, the phrase suggests that someone is dropping their guard, allowing themselves to be more open, spontaneous, or unrestrained. It is often employed when someone is in a more relaxed environment or with people they feel comfortable around. In such situations, individuals may let their hair down by engaging in uninhibited conversation, indulging in lighthearted activities, or expressing their true feelings and emotions without worrying about judgment or consequences.
This expression can also be used to describe a temporary release from the pressures or demands of a formal or professional setting. It implies that someone is loosening up or taking a break from the usual strict rules, regulations, or protocols associated with their work or responsibilities.
Overall, "letting one's hair down" signifies embracing a more carefree or unconstrained demeanor, allowing oneself to enjoy a sense of freedom, spontaneity, and authenticity in social interactions or personal expression.
