scrape the bottom of the barrel

Derived from the historical practice in the early European history of storing food in barrels; when food supplies ran low, only what was on the very bottom of the barrel remained, and had to be removed by scraping. Oil in a barrel has different fractions with a different weight. The heavier fractions like asphaltum sink to the bottom of the barrel and can be difficult to scrape from the bottom.

• "They must really have been scraping the bottom of the barrel if they couldn't find a better design than that."
• "The bottom of the barrel was scraped on August 22 when Shrewsbury had to produce Taunton 2-6-0 No. 6312 to work the 8.10 p.m. from Paddington between Wolverhampton and Shrewsbury; the stranger was in trouble in the early hours of the next morning at Hollinswood, but managed to reach Shrewsbury."
• "We have so few ships that are mission—ready, they are scraping the bottom of the barrel. We are to the point where three damaged ships are being stripped to make one flyable ship."

• scrape the barrel