打個岔 的英文怎麼說?

[1] to talk over somebody[2] interrupt[3] cut in
  cut into[4] butt in
  butt into

to talk over somebody = 打斷某人，比較口語但非常貼切

interrupt 普遍又好用，又很簡單，例如:

interrupt our conversation = 插嘴，打斷正在講話的我們
interrupt me = 插嘴，打斷正在講話的我