A particular style in which someone's hair is cut, arranged, or styled.
A 20th-century compound word combining 'hair' (Old English 'hær') and 'do' (shortened form of 'dressing' or 'doing'). It emerged as casual American slang, similar to 'haircut' but emphasizing the styling aspect.
The word 'hairdo' is fascinating because it's one of the few English words where we use 'do' as a noun meaning 'hairstyle'—yet we also say 'I got my hair done,' showing how flexible language is with the same word in different forms.
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