hair 
/ˈheɚ/ noun
plural hairs /ˈheɚ/ noun 1 a [count] : a thin threadlike growth from the skin of a person or animal
▪ He plucked a hair from his arm. ▪ There are dog/cat hairs all over my coat.
b [noncount] : a covering or growth of hairs
▪ The hair on her arms is blond. ▪ He has a lot of hair on his chest. ▪ facial/pubic hair
c [noncount] : the covering of hairs on a person's head
▪ He got his hair cut last week. ▪ Your hair looks nice. ▪ She has long/black/straight hair. ▪ He has a thick/full head of hair. ▪ a balding man who is losing his hair ▪ a lock/strand of hair ▪ hair conditioners/curlers ▪ a hair dryer ▪ I'm having a bad hair day. [=my hair does not look nice today] 2 [singular] informal : a very small distance or amount
▪ He won the race by a hair. ▪ He was a hair off on the count.
▪ He plucked a hair from his arm. ▪ There are dog/cat hairs all over my coat.
b [noncount] : a covering or growth of hairs
▪ The hair on her arms is blond. ▪ He has a lot of hair on his chest. ▪ facial/pubic hair
c [noncount] : the covering of hairs on a person's head
▪ He got his hair cut last week. ▪ Your hair looks nice. ▪ She has long/black/straight hair. ▪ He has a thick/full head of hair. ▪ a balding man who is losing his hair ▪ a lock/strand of hair ▪ hair conditioners/curlers ▪ a hair dryer ▪ I'm having a bad hair day. [=my hair does not look nice today]
▪ He won the race by a hair. ▪ He was a hair off on the count.
hair of the dog (that bit you)
informal : an alcoholic drink that is taken by someone to feel better after having drunk too much at an earlier time
hide or hair, hide nor hair — see 2hide
in your hair
informal ◊Someone who is in your hair is bothering or annoying you.
▪ His wife says that since he retired he's in her hair all day because he's at home so much.
▪ His wife says that since he retired he's in her hair all day because he's at home so much.
keep your hair on
Brit, informal — used to tell someone not to become too excited or upset
let your hair down
informal : to relax and enjoy yourself
▪ We work hard all week, so when Friday comes we like to let our hair down a little and have some fun.
▪ We work hard all week, so when Friday comes we like to let our hair down a little and have some fun.
make your hair curl
informal ◊If something makes your hair curl, it frightens, shocks, or surprises you.
▪ I've heard stories about that guy that would make your hair curl.
▪ I've heard stories about that guy that would make your hair curl.
make your hair stand on end
informal ◊If something makes your hair stand on end, it frightens you.
▪ Just hearing his voice makes my hair stand on end.
▪ Just hearing his voice makes my hair stand on end.
not have a hair out of place
informal : to have a very neat appearance
▪ a politician who never has a hair out of place
▪ a politician who never has a hair out of place
not turn a hair
informal : to remain calm even though something frightening or shocking has happened
▪ Most people would have been very nervous in that situation, but she never turned a hair.
▪ Most people would have been very nervous in that situation, but she never turned a hair.
out of your hair
informal ◊Someone who is out of your hair is no longer bothering or annoying you.
▪ Let me take the children out of your hair while you cook dinner.
▪ Let me take the children out of your hair while you cook dinner.
pull your hair out or tear your hair out
informal : to be very worried or upset about something
▪ We've been tearing our hair out trying to decide what to do.
▪ We've been tearing our hair out trying to decide what to do.
split hairs
: to argue about small details or differences that are not important
▪ His lawyers are splitting hairs over the wording of his contract. — see also hairsplitting
▪ His lawyers are splitting hairs over the wording of his contract. — see also hairsplitting
— haired /ˈheɚd/ adjective
▪ a long-haired cat ▪ a dark-haired person
/ˈheɚd/ adjective ▪ a long-haired cat ▪ a dark-haired person
— hair·less /ˈheɚləs/ adjective
▪ a hairless breed of cat
/ˈheɚləs/ adjective ▪ a hairless breed of cat
