Meaning of “that is to say ...” in the English Dictionary

british dictionary

"that is to say ..." in British English

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that is to say ...

or more exactly:

Our friends, that is to say our son's friends, will meet us at the airport.

that is (to say)

C1 said when you want to give further details or be more exact about something:

I'll meet you in the city, that is, I will if the trains are running.

(Definition of “that is to say ...” from the Cambridge Advanced Learner’s Dictionary & Thesaurus © Cambridge University Press)