1The beginning of something, especially something unpleasant: the onset of winter [as modifier, in combination]: early-onset Alzheimer’s disease
More example sentences
- Already this year, the number of deaths has reached 32 and emergency chiefs fear the onset of poor winter weather may bring more.
- The onset of winter appears to have been delayed, throwing many plants into confusion.
- The parents said they then witnessed a regression in their children's behaviour and speech, as well as the onset of an unpleasant bowel disorder.