ichidan verb
start to forget; be on the verge of forgetting
Describes the beginning of forgetting or almost forgetting something. Often used when a memory is fading or when one nearly fails to recall or do something.
彼の名前を忘れかけている。
I'm starting to forget his name.
大事な用事を忘れかけて、慌ててメモを見た
I was about to forget an important errand and hurriedly checked my notes.