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worst2
1 the person or thing that is worse than all others [↪ the best]
the worst
at its/his etc worst 
You saw the garden at its worst, I'm afraid (=when it is worse than any other time).
You saw the garden at its worst, I'm afraid (=when it is worse than any other time).2 most of something, or the most unpleasant or difficult part of it : The worst of the storm seemed to be over.
the worst of something
The worst of the storm seemed to be over.3 to expect or fear that something will not be successful or something bad will happen : When it got so late and they still weren't home, I began to fear the worst.
expect/fear the worst
When it got so late and they still weren't home, I began to fear the worst.6 used to say that someone can try to harm you but they will not be able to : They can do their worst now, because I'm leaving in three weeks.
do your/his/her/their worst
They can do their worst now, because I'm leaving in three weeks.7 if the situation develops in the worst possible way : If the worst comes to the worst, we'll sell the car.
if the worst comes to the worst
especially British English, if worst comes to worst especially American EnglishIf the worst comes to the worst, we'll sell the car.
