Hi, No. Do you perhaps mean 'all that is left to say', meaning 'this is the only thing that remains to be said'? Clive
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I wouldn't say it's an idiom (the meaning is not clear from the phrase itself), but "all this to say" or "all that to say" are somewhat common phrases used to start a summary of the previous content. For me, it conveys that the writer recognizes the previous content was unnecessarily long and indirect.