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Meaning of 'Clean as a whistle'

What does the saying 'Clean as a whistle' mean?

Idiom: Clean as a whistle

Meaning:

If something is as clean as a whistle, it is extremely clean, spotless. It can also be used to mean 'completely', though this meaning is less common nowadays. If somebody is clean as a whistle, they are not involved in anything illegal.
Country: International English | Subject Area: General | Usage Type: Both or All Words Used
All idioms have been editorially reviewed. Submitted idioms may have been edited for correctness and completeness.
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