Chunk is a thick, solid piece of something, usually broken or cut off from something larger. You might bite off a chunk of apple, throw a chunk of wood on a campfire, or find a chunk of concrete that broke off a sidewalk. The word suggests something substantial and irregular, not a thin slice or tiny crumb.

The word also describes how our brains organize information. When you learn something new, your mind naturally groups related ideas into chunks to make them easier to remember. A phone number like 5-5-5-8-2-1-4 is easier to recall when you chunk it: 555-8214. Good students chunk information when studying: instead of memorizing fifty random facts, they group them into five or six meaningful categories.

When you chunk something down, you break a big task into smaller, manageable pieces. Writing a ten-page report feels overwhelming, but chunking it into one page per day makes it achievable. Athletes, musicians, and anyone mastering a complex skill use chunking to practice: they work on small sections until each chunk becomes automatic, then connect them into a smooth whole.