What are the possible meanings of "I've got it"? As far as I know, it may mean possession like here:
– Jack you also need to have a backpack if you want to go with us.
– Well, I've got it.
Here Jack reports his possession of a backpack.
Also, as I can tell from my Google research, it may mean the possession of some non-physical things like ideas or infections:
– I've got it! We will go by train instead!
– Now I know for sure that I've got it, too. Doctors completed the test and it came back positive.
But are there any other meanings that this phrase may usually convey?
Please, note that I mean exactly the phrase "I've got it." (not "I got it", "I get it", "I've gotten it", "I've got it all", "I've got it down", etc.)