The idiom "long arm of the law" refers to the legal system or authorities that have significant power or influence, especially in criminal matters. It suggests that the reach of the law is far-reaching and can extend to all corners of society.

The idiom "means to an end" is a common phrase used to describe something that has no inherent value, but serves a specific purpose or leads to a desired outcome. It can also refer to the actions taken to achieve that end result.

The idiom "acid test" refers to a situation or event that is used to determine whether someone or something is genuine, authentic, or trustworthy. It can also refer to a challenging or demanding task or experience that tests one's skills or abilities.

The idiom "dab hand" means someone who is very skilled, competent, or adept in what they do. They have a natural talent or ability that makes them particularly good at their job or task.

The idiom "bite the dust" is a figurative expression used to mean "to accept or endure an unpleasant, difficult, or embarrassing situation." The phrase originated from the practice of biting on a piece of leather or cloth as a way to cope with pain during surgery or amputations.