This
database is a comprehensive collection of all the American idioms and slang available.
American Idioms are many and varied. We hope you enjoy our collection. We are adding more all the time.
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If a person sells their birthright for a mess of pottage, they accept some trivial financial or other gain, but lose something much more important.
'Sell your soul for a mess of pottage' is an alternative form.
If someone has used all their energy on something, but must continue, they are running on fumes. It is an expression used when driving a car when the needle is on empty but still running. We say it is 'running on fumes'.