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  • Stiffen up Verb
  • Stiffen a farthingale
  • Stiffen competition
  • Stiffen opposition
  • Stiffen penalties
  • Stiffen resistance
  • Stiffen resolve
  • Stiffen up (someone's) joints
  • Stiffen up (someone's) muscles
  • Stiffen up (someone's) resolve
  • Stiffen up (someone's) spine
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