know something inside and out
對某事非常熟悉，了解其內(nèi)外
口語·表達精通某事
英文釋義
to be extremely knowledgeable or familiar with something, to know every aspect or detail of it
例句
After years of practice, she knows the piano inside and out.
典故來源
源于物理空間概念，比喻對某物從內(nèi)部到外部都熟悉，強調(diào)全面了解。