Forget/fərˈɡet/ Definition 1 of 4Pro Tip 1/3Temporary Forgetfulness Used to express that something slipped one's mind temporarily but can be remembered later. I forgot her name, but then it came back to me. Pro Tip 2/3Intentional Reminder Often used in a polite request to remind someone of something they might have forgotten. Don't forget to call me when you arrive. Pro Tip 3/3Emotional Impact Forgetting something important can imply carelessness and hurt feelings. He forgot our anniversary, and I was really upset.