Toughen, as glass or steel

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Hello crossword lovers! This time we are going to solve the term Toughen, as glass or steel from the Universal Crossword. The term Toughen, as glass or steel can mean many different things. After some research we have found the solution for the Universal Crossword Answer. If you scroll down the page, choose the number of letters for the Toughen, as glass or steel term, and then you will find the correct answer.

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The answer has 6 letters: ANNEAL

Last usage in Universal crosswords puzzle.