verharden (ww):
indurirsi(en) to become hard.
(en) to become or make less sensitive.
(en) to make hard(er)., abituare(en) to cause to become accustomed to something unpleasant by prolonged exposure., acclimare(en) to cause to become accustomed to something unpleasant by prolonged exposure., acclimatare(en) to cause to become accustomed to something unpleasant by prolonged exposure., assestarsi(en) to gel or harden., assuefare(en) to cause to become accustomed to something unpleasant by prolonged exposure., solidificarsi(en) to gel or harden.
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Via: Memodata.com