This article deals with diaphasic variation regarding the use of phraseologisms expressing paralipsis in French (pour ne pas le nommer, inutile de le dire, etc.) and in English (needless to say, that goes without saying, etc.). It compares the syntactic and pragmatic behaviour as well as the degree of fixedness of these phrasemes in formal (parliamentary debates) and informal oral discourse and highlights the differences in their use in the two types of discourse considered for this study.