DictionaryredoubleIncrease greatly
verb

redouble

ree-DUB-uhl/ˌriːˈdʌbl/

To increase greatly in strength, amount, or effort.

The man redoubles his effort, scrubbing the stubborn stain with both hands.

A two-panel sequence shows the same man redoubling his effort to scrub a stubborn stain: first wiping lightly with one hand, then leaning in and vigorously scrubbing the same spot with both hands.
Etymology

Doubling again or repeatedly supplies an image of multiplication. Applied to effort or intensity, that image expresses a vigorous increase in how much energy or force is brought to bear.

In context

The Scottish Parliament55:21
we see an us-versus-them politics rising across our country across Europe and across the world we have to redouble our efforts to fight for equality
Debate: International Women’s Day 2019: Balance for Better - 7 March 2019

More examples

  • The setback only redoubled her determination to succeed.
  • We must redouble our precautions during the dry season.
  • The team is redoubling its efforts to restore power.

Forms

redouble · redoubles · redoubled · redoubling

Similar words

intensify
Emphasizes greater strength or severity, not necessarily renewed effort.
increase
Covers any growth, without implying a large or forceful change.
strengthen
Emphasizes making something stronger rather than increasing its amount.