torch

A portable light produced by the flame of a stick of resinous wood or of a flammable material wound about the end of a stick of wood; a flambeau.

A flashlight.

Something that serves to illuminate, enlighten, or guide.

An arsonist.

A portable apparatus that produces a very hot flame by the combustion of gases, used in welding and construction.

Longstanding unrequited romantic feelings for a person.

To cause to burn or undergo combustion, especially with extraordinary rapidity, force, or thoroughness.

(carry a torch) To have longstanding feelings of love that are not requited.

(put to the torch) To destroy by fire; burn down.