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Originally Posted by binhco  Thank you, but " A rolling stone gathers no moss" is said an idiom on "Idioms" under the category bar "Language Reference", on the left-hand side of the screen in this website (forum page),  |
Yes this could be considered an idiom...and frankly you could have found out that before asking the question by consulting that list.
To me a proverb is a wise saying...the meaning is clear and provokes thought.
for example this is a Chinese proverb that I like:
Be not afraid of growing slowly, be afraid only of standing still.
The meaning is clear and not hidden, at the same time makes you think of your life.
With an idiom the meaning is usually confusing to a non-native English speaker and sometimes to a native English speaker (though we can often figure them out)
I'll bet that watch cost him a pretty penny!
Cost him a pretty penny is an idiomatic expression meaning: is expensive
An expression is just a collection of words expressing a thought. Idiomatic expression and idiom mean the same thing. An idiomatic expression just uses more words to express the thought.