(forget to do something)
to be forgotten―pass out of mind―pass out of one's memory―fade from one's memory―escape one's memory―slip one's memory―fall into oblivion―be buried in oblivion
消し忘れ
忘れる.
to forget something
to carelessly forget to say something
to forget oneself―lose oneself (in admiration)―be lost (in admiration)―be absorbed (in study)―be engrossed (in one's business)―be beside oneself (with joy or grief)
ゆめ忘るな
忘れっぽくなる.
to lose something by forgetting about it
will never forget