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Related to that is: that is to say
In other words; or, to clarify or explain more clearly. No, I have never met him—not formally, that is. I'll be there this afternoon. That is, after about four o'clock or so. Yep, we planned to drive together. That is, if you still want to go.
Farlex Dictionary of Idioms. © 2015 Farlex, Inc, all rights reserved.
Also, that is to say. To explain more clearly, in other words, as in It's on the first floor, that is, at street level, or We're coming next month, that is to say, in November. [Early 1600s] Also see under that's.
The American Heritage® Dictionary of Idioms by Christine Ammer. Copyright © 2003, 1997 by The Christine Ammer 1992 Trust. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
that is (to say)
1 in other words: I’m between jobs at the moment; that’s to say unemployed. ♢ It cost him a week’s wages, that is, €300.
2 used to give more information or to correct what has already been said: She’s a housewife — when she’s not teaching English, that is. ♢ Let him explain it — if he can, that is. ♢ Nobody wants to do it. Nobody except me, that is.
Farlex Partner Idioms Dictionary © Farlex 2017
To explain more clearly; in other words: on the first floor, that is, the floor at street level.
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.