If the lower branches do not get sun, they will start dying out and you will have a bush with no lower branches. Also, do not prune an evergreen shrub with needles too far or you might have limbs ...
Meaning: Holly is an evergreen plant that has long limbs and small, dark leaves with several clumps of pea-sized red berries. When the holly plant’s limbs are cut, it is called a bough of holly.