in other words; i.e.

My father died three years ago, that is to say in 1977.

Apparently we're just two peas in a pod.

In other words, he doesn't want to do it.

Standard Chinese, commonly referred to as Mandarin, is based on Pekinese.

In three days—that is to say, on Monday next—matters will be ripe, and the Professor, with all the principal members of his gang, will be in the hands of the police.