1. Noun:
* A person who passes something: "The passer of the ball was penalized for holding."
* A person who walks or goes by: "The passerby saw the accident."
* A type of small bird: "A house sparrow is a common passer."
2. Verb:
* To move past something or someone: "The car passed the truck."
* To go beyond a limit: "The students' scores passed the minimum requirement."
* To transfer something to another person: "He passed the baton to his teammate."
* To die: "She passed peacefully in her sleep." (more formal and indirect way of saying "died")
3. Adjective:
* Passing: "The passer train was delayed."
The specific meaning of "passer" will depend on the context in which it is used. If you can provide me with the sentence or situation you are referring to, I can help you understand the meaning more precisely.