Metaphors for knowledge
Getting knowledge about something is like making a map of a place or like travelling there. Teaching someone is like showing them how to reach a place. For example:
- In today’s class, I will map out the most important concepts.
- It is an excellent guide to English vocabulary.
- The program allows you to navigate the Web more easily.
When you have some knowledge about something, it is as if you are shining a light on it. Not having knowledge is like being in darkness, e.g.:
- Allow me to shed/throw some light on the matter.
- There are a couple of points that I’d like you to clear up.
- He kept us in the dark about his plans.
- I haven’t got the foggiest/faintest idea.
For more metaphor examples, see the word knowledge in Macmillan Dictionary.
Can you think of more examples? If so, please add them below in a comment.

Thanks so much for the metaphors: I can see clearly now that the rain of idioms is gone and all of the idiomatic expressions have slipped away