a state of being very tired in a nervous or slightly anxious (= worried and nervous) way after a lot of mental or physical effort

She's worn herself to a frazzle (= made herself very tired and nervous) trying to meet the deadline. 为了能如期完成，她把自己弄得筋疲力尽。

a state of being completely burned or tired out

I went to answer the phone and when I came back the eggs were burned to a frazzle. 我去接了电话，回来的时候鸡蛋全都煮焦了。