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know sth like the back of one's hand
to know sth like the back of one's hand
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to be well-informed about or completely familiar with something
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What is the origin of the idiom "know something like the back of one's hand" and when to use it?
The idiom "know something like the back of one's hand" suggests that someone is intimately familiar with a subject or topic, just as they are with the physical features of their own hand. It implies a deep and thorough knowledge of the subject. This expression is used to emphasize how well someone knows or understands something, indicating a high level of familiarity and expertise.
Пример
I've lived in this town for years, so I know the streets like the back of my hand.
She's been studying French for years, so she knows the language like the back of her hand.
She knows the city like the back of her hand, having lived there for years.
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