To make or become physically hard or harder
“Indigenous people of those areas were the first to notice that the liquid would gradually harden and turn black on exposure to air.”
To cause someone or something to become stronger, literally or figuratively
“Of course, she would read what he had written, and in his words find that which would harden her against the trials to come.”
To cause (someone) to become accustomed to a difficult situation or environment
“She juggled three jobs to pay for an overseas adventure that would harden her to the battles she would later have in business.”
To dull or desensitize, emotionally or physically
“An instant later, her eyes seemed to harden and become as hard and cold as the rock whose color they took.”
To impart vigor, strength, or vitality to
To become covered in ice, usually of a body of water
To cause to become dry or devoid of moisture
To teach, train or educate in a given field
To gradually appear or develop
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