not worth salt

all one's life's worth

A momentous matter; a very serious risk; a difficult task or situation.

Attic salt

Pointed and delicate wit.

covenant of salt

A long-lasting agreement.

dime's worth

An insignificant amount

money's worth

Satisfaction.

not worth a brass farthing

Worth nothing or next to nothing.

not worth a Continental

worthless, lacking in value, especially due to economic inflation.

not worth a dime

Worthless or nearly so: lacking in value.