onset

n. /ˈɑːn.set/ C1

发作；开始

The beginning of something, especially something unpleasant.

仙境例句

At the first onset of sneezing, Alice wished she had stayed outside with the Frog-Footman.

喷嚏刚一开始打，爱丽丝就后悔没跟青蛙仆人一起待在外面。