tensification — A phonological phenomenon that the common sounds 'ㄱ', 'ㄷ', 'ㅂ', 'ㅅ', 'ㅈ', etc. are pronounced as sounds such as 'ㄲ', 'ㄸ', 'ㅃ', 'ㅆ', 'ㅉ' in a specific environment.