Synonyms of 'hair'
idioms:by a hair
related mania trichomania
figurative note:Hair has long been a focus of care and attention for humans, even seen as our 'crowning glory'. The extended meanings and idioms involving hair tend to refer either to the physical appearance of hair or the emotions. A hair describes a very small amount or distance in the expression by a hair ('s breadth), meaning 'very close', which is also like the phrase by a whisker. Physical fineness of hair is also referenced in the expression split hairs whereby petty distinctions are made. Other expressions with hair allude to emotional states, such as get in your hair meaning 'annoy'. The idea that emotions can affect the hair has its foundation in fact in that cold, fear, and shock cause body hair to erect, literally hair-raising or making your hair stand on end. In olden times, the elaborate hairdressing of ladies and gentlemen in public meant that they would only let their hair down in private, thus the meaning of relaxing, or becoming confidential, developed.
Doth not even nature itself teach you, that if a man have long hair, it is a shame unto him? But if a woman have long hair, it is a glory to her[Bible: I Corinthians]
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If someone has a mop of hair, they have a lot of hair and it looks rather untidy.
He was dark-eyed with a mop of tight curls.
Thesaurus for hair from the Collins English Thesaurus
Your hair is the fine threads that grow in a mass on your head.