clinker

/ˈklɪŋkər/
noun
  1. A hard, stony material that forms when coal or other fuel is burned, often found in furnaces or fireplaces.
    • The old steam engine left a pile of clinker beside the tracks.
    • The blacksmith removed the clinker from the forge before adding more coal.
    • After the campfire burned out, we found a lump of clinker in the ashes.
  2. A type of hard brick made by burning clay at a very high temperature, often used in paving or building.
    • The old warehouse walls were built from rough clinker blocks.
    • They used clinker for the factory floor because it was very durable.
    • The garden path was paved with dark red clinker bricks.
  3. A mistake or failure; something that goes wrong. (informal)
    • I thought I had the answer right, but it turned out to be a clinker.
    • His first attempt at baking bread was a clinker—it came out like a rock.
    • The movie was a real clinker; the critics hated it.
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