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snowball

snowball - verb

  1. To increase or expand suddenly, rapidly, or without control: explode, mushroom. See increase.
  2. To make or become greater or larger: aggrandize, amplify, augment, boost, build, build up, burgeon, enlarge, escalate, expand, extend, grow, increase, magnify, mount, multiply, proliferate, rise, run up, soar, swell, upsurge, wax. Informal beef up. See increase.