It's a root that appears in many English words, often with a related meaning of trust, belief, or confidence.
Here are some examples of words with the "fid" root:
* Confide: To share secrets or private information with someone you trust.
* Fidelity: Faithfulness or loyalty, especially in a relationship.
* Infidel: Someone who does not believe in a particular religion, especially the Christian religion.
* Confident: Feeling or showing certainty about something.
* Diffident: Lacking confidence in oneself; shy or timid.
While the exact meaning of "fid" can vary depending on the word, its core meaning is always tied to trust, belief, or faith.