I'm not a native-speaker; sometimes prepositions (or adverbs) are tricky for non-native speakers.
"Pass the book on to me when you've finished with it."
In this sentence, I don't know what does 'on' mean? I understand what 'on' means in these sentences:
There's a mark on your skirt.
Put your coat on.
But when we use 'pass something on to'... What nuance of meaning of the word 'on' is here?
Is it possible to omit 'on'?
"Pass the book to me when you've finished with it."
Would it still be the same meaning? Why does first sentence have 'on'? And could you tell me some example sentences with this meaning of 'on' in them?