Is 'over' in #1 part of the phrasal verb but in #2 as a preposition? Does 'over' in #2 mean 'on'/upon'?
1- "I fell over a stone".
2- "I fell over a cliff"
1- "I tripped over a stone". It is a regular verb + prepositional phrase. " Over is possible, but the more frequent preposition is "off".
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1- "I tripped over a stone".
It is a regular verb + prepositional phrase.
https://idioms.thefreedictionary.com/trip+over
2- "I fell off a cliff."
Over is possible, but