To forget means to lose the memory of something or to fail to remember it. When you forget your friend's birthday, the date slips out of your mind even though you knew it before. When you forget where you put your homework, you can't recall setting it down even though you did it just hours earlier.

Everyone forgets things. You might forget to bring your lunch, forget the name of someone you just met, or forget what you were about to say mid-sentence. Sometimes forgetting happens because you weren't paying close attention in the first place. Other times, memories simply fade over time, like how you might vividly remember yesterday's soccer game but have trouble recalling the details of a game from two years ago.

The word can also mean to stop thinking about something on purpose. When someone says “forget about it” after you apologize, they mean they're choosing to let go of whatever bothered them. Teachers might tell students to forget everything they thought they knew about a topic before introducing a completely new way of understanding it.

Interestingly, forgetting isn't always bad. Your brain actually forgets unimportant details so it can focus on what truly matters, like remembering your best friend's face rather than what shoes a stranger wore last week.