The idiom "arm in arm" means to walk or move together closely, usually holding hands or being physically close to one another. It can also refer to someone who is an intimate friend or confidant.

The idiom "no feeling is final" means that one's emotions or feelings are not always accurate or reliable, as they can change over time.

The idiom "as long as" is a conjunction that is used to connect two clauses, expressing the idea that something must be done or maintained, provided that certain conditions are met.

The idiom "as calm as a toad in the sun" means to be completely relaxed, tranquil, and at ease. The figurative meaning of this idiom is that a person who appears calm and composed has no inner turmoil or discomfort.

The idiom "Van Gogh’s ear for music" means having a highly sensitive and appreciative ear for music, or being able to appreciate music on a deep level.