Block

v. t.
  1. To obstruct so as to prevent passage or progress; to prevent passage from, through, or into, by obstructing the way; -- used both of persons and things; -- often followed by up; as, to block up a road or harbor; to block an entrance.
  2. To secure or support by means of blocks; to secure, as two boards at their angles of intersection, by pieces of wood glued to each.
  3. To shape on, or stamp with, a block; as, to block a hat.
  4. to cause (any activity) to halt by creating an obstruction; as, to block a nerve impulse; to block a biochemical reaction with a drug.
    5. To block out ,
    to begin to reduce to shape; to mark out roughly; to lay out; to outline; as, to block out a plan.