hair · noun /her/Full view
Nouns: hair
Adjectives: hairy
hair (ON HEAD)
A1 U the thin, thread-like parts that grow on your head
Dictionary examples:

curly/straight hair

blond/dark/fair/gray/red hair

She has long/short/shoulder-length brown hair.

I'm going to get my hair cut.

Learner example:

She has long and dark hair, she has a big eyes, she is a serious girl. (Skills for Life (Entry 1); A1; Portuguese)

hair (SINGLE PIECE)
B2 C,U one or more of the thin thread-like parts that grow on a person's or animal's skin
Dictionary examples:

He's starting to get a few gray hairs now.

My black skirt was covered in cat hair.

Learner example:

Then he appeared: a [fat], middle-aged man with only a few hairs on his head. (First Certificate in English; B2; German)

let your hair down
C2 to be very relaxed and enjoy yourself a lot
Dictionary example:

I'd love to see Clare let her hair down for once.

Learner example:

Thrace hosts every year, festivals and carnivals where all the family can let [their] hair down and have fun. (Certificate of Proficiency in English; C2; Greek)

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