the third degree
US /ðə θɜrd dɪˈɡri/
UK /ðə θɜrd dɪˈɡri/

1.
严厉盘问, 严刑拷打
intense questioning or interrogation, often in a harsh or prolonged manner
:
•
My parents gave me the third degree when I came home late.
我回家晚了,父母对我进行了严厉的盘问。
•
The police gave the suspect the third degree for hours.
警方对嫌疑人进行了数小时的严厉审问。