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Meanings
Adverb
1. I mean; that is to say (used to introduce a new idea or explain a previous one) (informal)
Examples5
You mean you didn't tell him anything?
That is, Father is two years older than Mother.
She met him the day before, that is to say May fifth.
This is my brother's wife. I mean, my sister-in-law.
He came to Tokyo five years ago, that is to say, when he was twelve years old.