The witness perjured himself.
证人作了伪证.
《现代英汉综合大词典》
The witness perjured herself by lying about what she did on the night o the crime.
证人对事发当晚所做的事情作了伪证.
互联网
The witness perjured himself by lying about what he saw on the sight of the murder.
证人谎称他目睹了那晚上的谋杀,他作了伪证.
互联网