Etymology

redouble

R1E1D2O1U1B3L1E1

Today it means: To double, especially to double again; to increase considerably; to multiply; to intensify. Full definition →

Middle French redoubler
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The story

  1. Middle French · derived fromredoubler
  2. English todayredouble

From Middle French redoubler. By surface analysis, re- + double.

Etymology from Wiktionary, CC BY-SA 4.0.