American Dictionary
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used for emphasizing that someone or something is the best, worst, biggest, etc. in the world
The Great Wall is the largest man-made structure on earth.
used for adding emphasis to negative statements
Nothing on earth could get me to speak to her.
There is no reason on earth why we shouldn't just leave.
used for adding emphasis to questions
What on earth do you mean?
Why on earth would I want to work for you?
very good or very bad
The sound effects are like nothing on earth.
