at (the) worst
used for saying what is the worst thing that can happenAt the very worst, he'll have to pay a fine.At worst this may mean the end of her playing career.
bring out the worst in somebody
to make somebody show their worst qualitiesPressure can bring out the worst in people.
do your worst(of a person) to do as much damage or be as unpleasant as possibleLet them do their worst—we'll fight them every inch of the way.
get the worst of it
to be defeatedHe'd been in a fight and had obviously got the worst of it.
if the worst comes to the worst(North American English also if worst comes to worst) if the situation becomes too difficult or dangerousIf the worst comes to the worst, we'll just have to sell the house.
the worst of all (possible) worlds
all the disadvantages of every situation