be not worth a brass farthing

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be not worth a brass farthing

To be completely worthless or useless; to have little or no value. Refers to farthings (obsolete British units of currency, worth one-quarter of a penny), formerly made from a copper alloy (brass). Primarily heard in UK. I was so excited when my grandfather said he'd give me his car, but this old clunker isn't worth a brass farthing. Over the years working here, I've come to realize that the boss's word isn't worth a brass farthing.
See also: brass, farthing, not, worth