that is to say ... Definition in the Cambridge English Dictionary
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Definition of “that is to say ...” - English Dictionary

Definition of "that is to say ..." - British English Dictionary

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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 ​furtherdetails 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 Learners Dictionary & Thesaurus © Cambridge University Press)
Translations of “that is to say ...”
in Chinese (Simplified) 更确切地讲, 也就是说…
in Chinese (Traditional) 更確切地講, 也就是說…
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