WordReference Random House Unabridged Dictionary of American English © 2020
down-the-line  (dounᵺə līn),USA pronunciation adj. 
  1. complete, full, unreserved, or whole-hearted:a down-the-line endorsement.

adv. 
  1. fully;
    completely;
    whole-heartedly:Will you support it down-the-line?
  • 1895–1900

'down-the-line' also found in these entries:
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