B2 having the part that is usually at the top turned to be at the bottom上下颠倒(地),翻转(地)
More examples
Turn the mould upside down and give it a gentle tap.
She came off her bike, which landed upside down in a muddy ditch.
Can you turn it round the other way, it's upside down.
It was an abstract painting and I couldn't tell whether it was upside down or not.
Place the tin upside down on a baking tray.
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