Concept:An idiom is a phrase with a figurative meaning different from its literal words.
Explanation:The idiom "pin back your ears" is a British expression meaning to listen very carefully.
It originates from the image of an animal pricking up its ears to focus on a sound.
This phrase is used when someone instructs you to pay close attention to what is being said.
For example: "Pin back your ears while the teacher is talking so you don't miss the assignment."
Among the given options, only option (1) – "To listen carefully to something" – correctly matches this figurative meaning.
Option (2) is incorrect because it refers to a person or organisation that pins important issues, which is unrelated to listening.
Option (3) is incorrect because it suggests keeping away from hearing bad stuff, not focused listening.
Option (4) is incorrect because it gives a literal interpretation of cleaning ears with a pin, which is not the intended meaning.
Understanding idioms requires knowing their non-literal usage.
Thus, the most appropriate answer is option (1).
Answer:Option (1) – To listen carefully to something.