what did your last slave die of

ain't what it used to was

Is not what it used to be; (expressing nostalgia).

breathe one's last

To die.

cobbler, keep to your last

One should not criticise matters outside one's field of expertise; one should mind one's business.

come what may

In spite of anything that might happen; whatever may occur.

cross my heart and hope to die

Added to a promise or a statement to show how serious one was about being honest in what one said

dead last

Finishing in last place in a competition or ranking, often by a considerable margin to the next to last place finisher or after an exceptionally poor showing or season.

die

To be or become hated or utterly ignored or cut off, as if dead.

die a thousand deaths

To suffer repeatedly (often mentally rather than physically); to suffer extreme embarrassment or anxiety.