Crossword puzzle clue "toughen up"

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Answer
Clue
Relevancy
aman
Clue
Make -- out of (toughen up)
anneal
Clue
Toughen
Toughen, as steel
Toughen, as glass
Treat with heat to toughen
Toughen, as glass or steel
Toughen or temper
Toughen glass
Definition
to make (as steel or glass) less brittle by heating and then cooling

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