The OnlineCrosswordSolver.com system found 2 answers for toughen steel crossword clue. Our system collect online crossword clues from most popular crossword puzzle, cryptic crossword, easy crosswords, mini crosswords that found in popular newspapers like nyt, guardian, daily telegraph etc.
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To subject to great heat, and then cool slowly, as
glass, cast iron, steel, or other metal, for the purpose of rendering
it less brittle; to temper; to toughen.
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