Definition of "chimney"

noun:
- A vertical tube or hollow column used to emit environmentally polluting gaseous and solid matter (including but not limited to by-products of burning carbon or hydro-carbon based fuels); a flue.
  
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- The glass flue surrounding the flame of an oil lamp.
  
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- The smokestack of a steam locomotive.
  
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- A narrow cleft in a rock face; a narrow vertical cave passage.
  
  from Wiktionary, Creative Commons Attribution/Share-Alike License
verb:
- To negotiate a chimney (sense #4) by pushing against the sides with back, feet, hands, etc.
  
  from Wiktionary, Creative Commons Attribution/Share-Alike License