1)
What is "ha'Pachas ha'Gadol"?
1.
Radak: It is the big cavity that was dug in the forest.
2)
Why does it say "Me'od"?
1.
Radak: The cavity was big, and they filled it with rocks, over Avshalom, and above the ground they erected a big heap [of rocks].
3)
Why is "l'Ohalav" written without a Yud?