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Deliberately and purposefully; as one planned or intended. I assure you that everything you saw has happened by design.
Farlex Dictionary of Idioms. © 2015 Farlex, Inc, all rights reserved.
On purpose, deliberately, as in Whether by luck or by design, his application was accepted. This term, originally put as on design, uses design in the sense of "plan." [First half of 1600s]
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.