A torch is a small electric light which is powered by batteries and which you can carry in your hand.

A torch is a long stick with burning material at one end, used to provide light or to set things on fire.

A torch is a device that produces a hot flame and is used for tasks such as cutting or joining pieces of metal.

If someone torches a building or vehicle, they set fire to it deliberately.

If you say that someone is carrying a torch for someone else, you mean that they secretly admire them or love them.

If you say that someone is carrying the torch of a particular belief or movement, you mean that they are working hard to ensure that it is not forgotten and continues to grow stronger.