The Oxford Thesaurus An A-Z Dictionary of Synonyms - block n.

1) piece, chunk, hunk, lump, slab; stump; brick, cube: The figure is carved out of a solid block of stone. 2) bar, obstacle, obstruction, hindrance, stumbling-block, deterrent, impediment, barrier: Her arrival should be no block to your leaving. --v. 3) obstruct, close off, barricade; bar, shut off; hinder, hamper, balk, impede, prevent: Entry to the playing field was blocked by the police. 4) block out. a rough out, design, outline, sketch, lay out, plan: The colonel blocked out a strategy for our escape. b mask, screen, blank (out) , erase, eliminate, exclude, blot out, deny: She has blocked out that part of her life from her mind. 5) block (up) . stuff (up) , congest, clog, Colloq Brit bung up: My nose is all blocked up because of this awful cold.