1. to be unable to remember something
2. to fail to do something because you did not remember it
3. to stop thinking about someone or something

Examples

• I always forget people’s names at parties.
• Don’t forget to lock the door when you leave.
• She forgot her umbrella at the restaurant.
• Try to forget about your troubles and enjoy the vacation.
• He forgot to call his mother on her birthday.
• I can’t forget the beautiful sunset we saw last night.
• Please don’t forget our appointment tomorrow.