To be unable to remember a fact, something that happened, or how to do something: To omit or neglect unintentionally: Be unable to think of or recall.
Why the hype around Gout Gout, the teenage Australian sprinting
I forgot to lock the gate. The meaning of forget is to lose the remembrance of : 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.