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1. To prevent something from being seen or noticeable or entering one's awareness. I have to block out all distractions and just sit down and write this paper. Your curtains aren't opaque enough to block out all of the sunlight. Some of the names on this list are blocked out, which means they're top secret.
2. To avoid thinking about or remembering something, often because it is stressful or traumatic. Many trauma victims try to block out the horrific things that have happened to them.
3. To reserve a period of time for someone or something. If I block out a chunk of my valuable time to meet with you, then you better show up! Mom made us all block out a few hours on Sunday afternoon to clean out the garage.
4. To thoroughly explain the details of something. After our new supervisor blocked out his vision for the department reorganization, it made a lot more sense to us.
block something out
1. to obscure a clear view of something. The trees blocked the sun out. The bushes blocked out my view of the car that was approaching.
2. to lay something out carefully; to map out the details of something. She blocked it out for us, so we could understand. Let me block out this project for you right now.
1. To prevent something from being seen: The smoke from the volcano blocked out the sun. This Internet filter blocks obscene language out.
2. To deliberately forget or stop thinking about something, especially something that is unpleasant: She blocked out the horrible details of the accident. The memories of his childhood were painful, and he blocked them out as much as he could.
3. To lay out or present the details of something: The director blocked out the actors' movements on stage. The city council blocked the new budget out.