noun A large solid piece of hard material, especially rock, stone, or wood, typically with flat surfaces on each side. (a block of marble) A large single building subdivided into separate rooms, apartments, or offices. (an apartment block) A large quantity or allocation of things regarded as a unit. (a block of shares) An obstacle to the normal progress or functioning of something. (substantial demands for time off may constitute a block to career advancement) A flat area of something, especially a solid area of color. (cover the eyelid with a neutral block of color) A pulley or system of pulleys mounted in a case. A person's head. (“I'll knock your block off,” he said)
verb Make the movement or flow in (a passage, pipe, road, etc.) difficult or impossible. (block up the holes with sticky tape) Impress text or a design on (a book cover). Shape or reshape (a hat) using a wooden mold. Design or plan the movements of actors on a stage or movie set.