definitions

I'll be seeing you

Also, see you. Goodbye, as in I have to go now; I'll be seeing you, or All right, see you. These colloquial formulas do not necessarily imply a future meeting. [Late 1800s]

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The American Heritage® Idioms Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.