He signed the confession under duress.

他出于被迫在供状上签了字。

《牛津词典》

He thought her confession had been made under duress.

他认为她是被迫坦白的。

《柯林斯英汉双解大词典》

Additionally, she had not had access to lawyers during her pre-trial interrogation during which she said she was assaulted and forced to sign a confession under duress, rights groups pointed out.

CNN: Outrage over beheading of Sri Lankan woman by Saudi Arabia

Human rights groups said Nafeek did not have access to a lawyer during her pretrial interrogation, during which she said she was assaulted and forced to sign a confession under duress.

CNN: STORY HIGHLIGHTS