Student or Learner
What is meaning of 'a little proud'?
Depends on the context. A nail that is not driven home and has its head above the wood is "a little proud".
I did not know the idiom to drive home to sy sg originates from the idea of driving a nail in a surface.
It doesn't, but if you are hammering nails into something, then they must be driven home - have no raised bits that can be felt. The same is used for screws. There - you have another usage to add to your vocabulary!
On the other hand, if you are pegging timbers with wooden pegs, the pegs must be left a little proud as they will need further hammering as the timber settles.