a pain in the neck

不快にさせる人や事
a pain in the ass も同じ意味だけど下品な言い方

Ex

  • He is a pain in the neck.
  • it is a pain in the neck.

Reference source

  • https://www.ihcway.com/1day/20151129121012.html
  • https://koala-times.com/a-pain-in-the-neck