- You have to push this button.
- You have to just push this button.
What role does the word 'just' play in the sentence above?
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just is suggesting an exact idea of how to do something.
The Oxford English Dictionary has a definition:
Exactly, precisely; verily, actually; closely
Without it, it's simply a blunt command to do something.
With it, it's proposing a specific task that will precisely accomplish what's needed.
Just kill him!