From The Collaborative International Dictionary of English v.0.44 [gcide]:
Block \Block\ (bl[o^]k), verb (used with an object) [imp. & p. p. {Blocked} (bl[o^]kt); p. pr. & vb. n. {Blocking}.] [Cf. F. bloquer, fr. bloc block. See {Block}, noun]
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.
With moles . . . would block the port. --Rowe.
A city . . . besieged and blocked about. --Milton.
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. [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.
From The Collaborative International Dictionary of English v.0.44 [gcide]:
1. The act of obstructing, supporting, shaping, or stamping with a block or blocks.
2. Blocks used to support (a building, etc.) temporarily.
From WordNet (r) 2.0 [wn]:
noun
1: (American football) the act of obstructing someone's path with your body; "he threw a rolling block into the line backer" [syn: {block}, {interference}]
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