Definitions
1.nounA 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 hydrocarbon based fuels); a flue.
2.nounThe glass flue surrounding the flame of an oil lamp.
3.nounThe smokestack of a steam locomotive.
4.nounA narrow cleft in a rock face; a narrow vertical cave passage.
5.verbTo negotiate a chimney (narrow vertical cave passage) by pushing against the sides with back, feet, hands, etc.