To omit or neglect unintentionally: To be unable to remember a fact, something that happened, or how to do something: If you forget something or forget to do it, you fail to think about it or fail to remember to do it, for example because you are thinking about other.
MCG food prices Footy fans could pay more food favourites Herald Sun
I forgot to lock the gate. The meaning of forget is to lose the remembrance of : Be unable to think of or recall.