to forget it
Tu devrais le faire tatouer sur ta bite pour ne pas l'oublier.
You should get it tattooed on your dick so you don't forget it.
— Le Tao de Steve (2000)
Il ne faut jamais l'oublier et savoir juger des choses dans la perspective.
It should never be forgotten, and one should know how to put things in perspective.
— Le repentir (1987)
It’s better to forget about it.
How could I have forgotten?
Elle nota leur nom afin de ne pas l'oublier.
She wrote down their name so she wouldn’t forget it.