what is the meaning of the phrase "put things in ones mouth"
I can't think of any meaning other than the literal one. I take it you have heard this as an idiomatic phrase. Can you give us some context?
I'm not sure I understand your question. Are you asking about the usage of "one" as a generic pronoun? In that context "one" simply means a person. So the sentence "One should not put things in one's mouth that are potentially harmful" means "A person should not put things in his or her mouth that are potentially harmful". Hope this helps - if not, just ignore meEmotion: smile
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I've had a 'Eureka' moment.

Did you hear the phrase 'to chew something over?'

This means that you want to take time to think something through thoroughly.
can u please give me some examples for the phrase "chew something over"
What about?

Don't put words in my mouth (i.e., Don't say that I've said something when I haven't said it.)
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It means to think about something before you give an answer. It's idiomatic: to chew food before you digest it.