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to know something like the back of one's hand
01
to be well-informed about or completely familiar with something
![to [know] {sth} like the back of {one's} hand definition and meaning](https://cdn.langeek.co/photo/44754/original/?type=jpeg "to [know] {sth} like the back of {one's} hand definition and meaning")
Idiom
InformalWhat 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.
例
She knows the city like the back of her hand, having lived there for years.
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.
