from way back
Since long ago; for a long time. For example, This painting has been in the family from way back, or We know the Smiths from way back. [Colloquial; 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.