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• v  act in opposition to
• v  oppose or check by a counteraction
• v  oppose and mitigate the effects of by contrary actions
  This will counteract the foolish actions of my colleagues
• v  destroy property or hinder normal operations

• Seinfeld, reportedly, will appear along side Microsoft founder Bill Gates in ads that will try to counteract the ultra-cool Apple ads (featuring Justin Long and John Hodgman).
• Marketing concerns aside, alcoholic energy drinks raise scientific questions: Does caffeine counteract the effects of alcohol? Or does it make drinking even more dangerous?.
• She's a fresh face to counteract Obama's message of change, and she's about as far outside the Beltway as you can get.

• antagonize
• antagonise
• countercheck
• countervail
• neutralize
• counterbalance
• sabotage
• undermine
• countermine
• subvert
• weaken

News & Articles

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• Scientists put backpacks on dragonflies to track their brains in flight
  The brain of a dragonfly has to do some serious calculations — and fast — if it hopes to nab a mosquito or midge in midair. It has to predict the trajectory of its prey, plot a course to intersect it, then make adjustments on the fly to counteract any evasive maneuvers.
  June 18, 2013 - Duke University
• NYC, San Francisco aim to stop 'Apple picking' phone muggings
  Smart phone theft is up nationwide, and especially in large cities. San Francisco District Attorney George Gascon and New York Attorney General Eric Schneiderman hope to counteract it. 
  June 13, 2013 - The Christian Science Monitor