lay a finger on (someone/something)
to touch or harm someone or something.
Honestly, I never laid a finger on him, he just fell over. (usually negative)
If you so much as lay a finger on my sister, I'll break your arm!
英语词组固定搭配大全包含18674条英汉双解词组，基本涵盖了全部常用英文词组、短语的翻译及用法，是英语学习的有利工具。