You don't know where it's been Meaning in English
expression
Definition
This phrase is used to warn someone not to touch or eat something because it might be dirty, used by others, or unsafe. It means you can't be sure about its past and should be careful.
Usage & Nuances
This is informal, used mainly in everyday speech when talking about hygiene or safety, especially with food, drinks, or objects. It's often said humorously or as a light warning. Not a literal question; usually means 'better not to risk it.'
Example Sentences
Don't eat that cookie—you don't know where it's been.
basic
I wouldn't pick up that coin—you don't know where it's been.
basic
Be careful! You don't know where it's been.
basic
He offered me a drink from his bottle, but I said, 'No thanks, you don't know where it's been.'
natural
Kids, please don't touch that stray cat—you don't know where it's been.
natural
I dropped my sandwich on the street. Guess I'll throw it away—you don't know where it's been after that.
natural