verb🔗ShareTo make tough."The difficult training regime is toughening the athletes for the upcoming competition. "qualityconditionprocessabilityChat with AIVocabulary GamePractice Reading
verb🔗ShareTo become tough."The young tree is toughening up against the strong winds. "conditionprocessqualitybodyChat with AIVocabulary GamePractice Reading
noun🔗ShareThe process of making something tougher."The winter boots underwent a special toughening to make them more resistant to ice and snow. "processmaterialtechnicalChat with AIVocabulary GamePractice Reading
