I wonder if my knowledge is right regarding the following phrases being prepositions:
i) over here
ii) over there
Both having the same construction= over (preposition) + here/there (adverb)
Perhaps, I'm wrong about this.
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That preposition has many uses, one given by Lexico is this:
4.2 At the other side of; beyond.
over the hill is a small village
You can call out
I am over here!
to someone who is looking for you, and
The bus stop is over there.
to indicate where you wait for a bus.