(informal) At worst, worst comes to worst, in the worst-case scenario.

Any situation or conclusion which could not be any better; the best possible outcome.

plural of best-case scenario

plural of worst-case scenario

(law) My argument is proven; I conclude my statement. / (idiomatic) The previous encapsulates my view.

(informal) To stop criticizing someone.

(colloquial) To make a fuss or uproar over something relatively insignificant.

plural of caseful