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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]


blocked \blocked\ adj.
1. closed to traffic. Traffic was blocked by an overturned
tractor-trailor

Syn: out of use(predicate).
[WordNet 1.5]

2. at a complete standstill because of opposition of two
unrelenting forces or factions.

Syn: deadlocked, stalemated.
[WordNet 1.5]

3. unusable because of some obstruction.
[WordNet 1.5]