mike check
noun [ C ] uk/ˈmaɪk ˌtʃek/ us/ˈmaɪk ˌtʃek/
检查话筒，检查麦克风
a check to see if a microphone is working correctly, usually by saying something into it
The sound engineers were up on the stage doing mike checks. 音响工程师在台上检查话筒。
US informal“检查话筒”（高声喊出以打断政客或其他人演讲的方式，然后告知自己为什么有异议）
a way of interrupting a politician or other person who is making a speech, by shouting "mike check" and then saying why you do not agree with what they are saying