From The Collaborative International Dictionary of English v.0.48 [gcide]: Block \Block\ (bl[o^]k), v. t. [imp. & p. p. Blocked (bl[o^]kt); p. pr. & vb. n. Blocking.] [Cf. F. bloquer, fr. bloc block. See Block, n.] 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. [1913 Webster] With moles . . . would block the port. --Rowe. [1913 Webster] A city . . . besieged and blocked about. --Milton. [1913 Webster] 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. [1913 Webster] 3. To shape on, or stamp with, a block; as, to block a hat. [1913 Webster] 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. [PJC] To block out, to begin to reduce to shape; to mark out roughly; to lay out; to outline; as, to block out a plan. [1913 Webster]