blocking

noun

• 1the action or process of obstructing movement, progress, or activity, in particular.
• obstructing or impeding the actions of an opponent in a game, especially (in ball sports) one who does not have control of the ball.
• Psychiatry the sudden halting of the flow of thought or speech, as a symptom of schizophrenia or other mental disorder.
• failure to recall or consider an unpleasant memory or train of thought.

• 2the grouping or treatment of things (e.g., items of data or shades of color) in blocks.
• the physical arrangement of actors on a stage or movie set.