Vocabulary What does ひやひや mean? ひやひや means nervous and uneasy (afraid of being found out or of something going wrong). Quick factsReadingひやひや ひやひやひやひやTOPICSnervous and uneasy (afraid of being found out or of something going wrong)Example sentences遅刻(ちこく)したのを先生(せんせい)に気(き)づかれないかと、ひやひやした。I was on edge, worried the teacher would notice I was late.