Makes or becomes harsh, severe, or rough (in third-person singular present tense).
From 'harshen' plus the third-person singular '-s' suffix used with 'he,' 'she,' or 'it.' Follows standard modern English verb conjugation.
You'd use this form when describing what happens: 'The winter harshens the landscape' or 'Her expression harshens when she's angry'—it's the simple present tense for one person or thing.
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