cast iron

/kæst ˈaɪərn/
adjective
  1. Made of a hard, brittle alloy of iron and carbon that is shaped by pouring molten metal into a mold.
    • The old cast-iron stove kept the whole cabin warm.
    • She fried the eggs in a cast-iron skillet.
    • They installed a cast-iron gate at the entrance to the park.
  2. Very strong, solid, or not able to be changed or broken.
    • Her cast-iron determination helped her finish the marathon.
    • The company has a cast-iron guarantee on all its products.
    • He had a cast-iron excuse for being late.
Antonyms
What does "cast iron" mean? | whatsthatwordmean | whatsthatwordmean