We found 2 dictionaries that define the word which is to say:

General (2 matching dictionaries)

1. which is to say: Merriam-Webster
2. which is to say: Wiktionary

Definitions from Wiktionary (which is to say) ▸ adverb:  Synonym of that is to say ▸ Words similar to which is to say ▸ Usage examples for which is to say ▸ Idioms related to which is to say ▸ Wikipedia articles (New!) ▸ Words that often appear near which is to say ▸ Rhymes of which is to say ▸ Invented words related to which is to say