1. if someone is as clean as a whistle, they are not involved in anything illegal.
He hasn't got a criminal record - he's clean as a whistle.
2. to be very clean.
The café's as clean as a whistle, and the food's excellent.
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。