Cold Iron

1. (Archaic) A metaphor for weapons made of iron or fighting with such weapons, similar to 'cold steel'

2. (Archaic) a poetic term for iron, commonly used to evoke a sense of hopelessness or oppression

3. (Folklore and Fantasy) a special type of material which harms or repells supernatural creatures, commonly ghosts or fey. It may simply iron which is cold, or iron which has only been cold worked.

1. The bandits were not prepared to face to cold iron of the brave knight
2. The criminal was placed in a cold iron cell
3. The only way to kill a fey is a cold iron dagger to the heart