**Rule: Understanding Phrasal Verbs.** The phrasal verb 'wear off' means for a feeling or the effect of something to fade away slowly. The 'novelty' or newness of a situation often diminishes over time. Option (a) is the correct definition. Option (b) is the opposite. Option (c) is a literal meaning of 'wear'. Option (d) is an unrelated action.

**Rule: Understanding Idiomatic Expressions.** The phrase 'the root of the problem' refers to the primary, underlying cause of an issue, as distinct from its surface-level effects ('symptoms'). The sentence structure itself contrasts the two concepts. Option (c) is the correct definition. Option (a) is the literal meaning of 'root'. Option (b) defines 'symptoms'. Option (d) is unrelated.

**Rule: Understanding Idiomatic Expressions.** The idiom 'sailing close to the wind' means to take risks and behave in a manner that is borderline illegal or improper. It implies that a small mistake could lead to disaster. Taking 'big risks' with company money fits this description perfectly. Option (b) is the correct definition. Option (a) is the literal origin. Option (c) is the opposite. Option (d) is a different approach to investing.

**Rule: Understanding Idiomatic Expressions.** The idiom 'open and shut' describes a case or problem that is easily resolved because the facts are clear. The sentence uses the negative ('not open and shut') to mean the opposite: that the case is *not* simple because the evidence is weak. Therefore, the idiom itself means simple and straightforward. Option (a) is the correct definition of the idiom. Option (b) is a literal misinterpretation. Option (c) describes the situation in the sentence. Option (d) is a different meaning of 'shut'.

**Rule: Understanding Idiomatic Expressions.** The idiom 'run around like a headless chicken' describes frenetic but purposeless activity. It is used for someone who is very busy but not achieving much because they are disorganized. Preparing for a party can often induce such panic. Option (b) is the correct definition. Option (a) is the opposite. Options (c) and (d) are incorrect interpretations.

**Rule: Understanding Idiomatic Expressions.** The idiom 'get someone's goat' means to irritate or anger them. The phrase 'he's just trying to annoy you' is a direct clue to the idiom's meaning. Option (c) is the correct definition. Option (a) is a literal misinterpretation. Option (b) is the opposite. Option (d) is an unrelated action.

**Rule: Understanding Idiomatic Expressions.** The idiom 'a law unto himself' describes a person who acts as if they are not bound by the normal rules or standards of behaviour that govern others. The fact that the boss 'doesn't follow the company's rules' is a direct explanation of this idiom. Option (b) is the correct definition. Option (a) and (d) are related to law but are not the meaning of the idiom. Option (c) is the opposite.

**Rule: Understanding Idiomatic Expressions.** The idiom 'the short end of the stick' refers to getting the unfair or disadvantageous share of something. Having to do a job alone that should be shared is a clear example of an unfair outcome. Option (c) is the correct definition. Option (a) and (d) are the opposite. Option (b) is a literal misinterpretation.

**Rule: Understanding Idiomatic Expressions.** The idiom 'all ears' means to be fully focused and keen to listen to what someone is about to say. One would expect students to listen attentively to a 'famous author'. Option (c) is the correct definition. Option (b) is a literal misinterpretation. Options (a) and (d) are the opposite of attentive listening.

**Rule: Understanding Idiomatic Expressions.** The idiom 'off the beaten track' (or 'path') refers to something that is uncommon, unconventional, or in a remote location. When applied to ideas, it means they are original and not mainstream. The word 'revolutionary' supports this meaning. Option (b) is the correct definition. Option (a) is the opposite. Option (c) is a literal interpretation. Option (d) is a different negative quality.