over the cliff

[user_gary]

The car went out of control and plunged over the cliff.

What does the preposition `over' mean here?

Please help me.

[Anglika]

The car went over the edge of the cliff.

If you spill a glass of water on your table and it pours onto the floor, the water went over the edge of the table.

Here is a car going over the edge of a cliff: http://tinyurl.com/2hg59p

[user_gary]

Thank you Anglika. I got it.

Similarly can I say the sentence like the followings :

Yesterday my book went/fell over the edge of the table.
I am sure one day she is going to be plunged over the edge of the terrace.

Are the sentences correct?
By the second sentence, I meant, One day I am going to push over her from the edge of the terrace.
Please help me.