verharden (ww):
σκληρύνω(en) to become or make less sensitive.
(en) to become hard.
(en) to make hard(er).
(ja) 固くする., εγκλιματίζω(en) to cause to become accustomed to something unpleasant by prolonged exposure., εξοικειώνω(en) to cause to become accustomed to something unpleasant by prolonged exposure.
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