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BBC Learning English - The English We Speak / To know something like the back of your hand
A popular expression for letting people know you are an expert
↗ https://www.bbc.co.uk/learningenglish/features/the-english-we-speak/ep-150901A popular expression for letting people know you are an expert
↗ https://www.bbc.co.uk/learningenglish/features/the-english-we-speak/ep-150901