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The idiom "walk on clouds" means to feel extremely happy or elated, as if one were floating or walking on air. It refers to a state of complete euphoria or bliss.
Yes, because you cannot literally walk on air.
Walking on air: to be exuberantly happy, excited, and joyful
I can't find any references to "walk on" someone - perhaps you are thinking of "walk over" someone. This idiom means to ignore someone's feelings and treat them with contempt, or to treat them without respect. In sports, you might use the idiom to mean that your team had an easy victory, though that is not as often used. Usually, if you say "He walked all over his father," you mean "He treated his father as if his father had no importance."
It's not really an idiom. You can figure out the meaning if you think about it. You're stretching your muscles.If someone says "I need to stretch my legs," however, they mean they need to walk around a little bit to think or to wake up.
Picture someone holding their nose up in the air - they look very aloof and snobbish, right? That's what this idiom means.
To tread lightly on a subject
It means that you were being very careful what you said and did, as though you were trying to walk across eggshells without breaking them.
Tread lightly, tiptoe, walk on eggshells
It's not really an idiom. It means "what are you thinking about."
It is not an idiom, it means your nose is itching.
RFP is not an idiom. It's an abbreviation.