What is the grammar of the word 'over' in the example:'The accident was already over when we arrived'
I know it means finished and I think it's an adjective but didn't find the same meaning in the adjectival uses listed by dictionary.com:
adjective 41. upper; higher up.
higher in authority, station, etc.
serving, or intended to serve, as an outer covering; outer.
remaining or additional, surplus; extra.
Neither did I find the same meaning in any of the other grammatical functions listed regarding 'over'
- too great; excessive (usually used in combination): Insufficient tact and overaggressiveness are two of his problems.