The French expression "aller sans dire" refers to something that goes without saying, or that is so obvious it doesn't need to be stated. There are several synonyms that can be used in place of this phrase, such as "être evident" (to be evident), "être clair comme de l'eau de roche" (to be as clear as crystal), "ne pas avoir besoin d'être precise" (to not need to be specified), "sous-entendre" (to imply), or "être implicite" (to be implicit). These phrases all convey the same idea that something is self-evident or understood without the need for further explanation.