What is the meaning of Chimney?

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 hydrocarbon-based fuels); a flue.

The glass flue surrounding the flame of an oil lamp.

The smokestack of a steam locomotive.

A narrow cleft in a rock face; a narrow vertical cave passage.

A vagina.

A black eye; a shiner.

To negotiate a chimney (narrow vertical cave passage) by pushing against the sides with back, feet, hands, etc.

Source: wiktionary.org