What it means

1. verb exert a force or cause a strain upon
   “This tax bears down on the lower middle class”
2. verb pay special attention to
   “The lectures bore down on the political background”
3. verb exert full strength
   “The pitcher bore down”
4. verb contract the abdominal muscles during childbirth to ease delivery
5. verb to make a rush at or sudden attack upon, as in battle
   “he saw Jess charging at him with a pitchfork”
6. verb exert a force with a heavy weight
   “The snow bore down on the roof”