**Rule: Understanding Idiomatic Expressions.** The British idiom 'go spare' means to become very angry or upset. Discovering a mistake in a report could easily provoke such a reaction from a boss. Option (a) is the correct definition. Option (b) and (d) are the opposite reactions. Option (c) is a literal misinterpretation.

**Rule: Understanding Idiomatic Expressions.** The idiom 'a man of his word' (or 'a woman of her word') describes a person who is reliable and can be counted on to do what they promise. The sentence structure itself provides a clear definition. Option (b) is the correct meaning. Option (a) is a different trait. Option (c) is the opposite. Option (d) is an incorrect interpretation of 'word'.

**Rule: Understanding Idiomatic Expressions.** The idiom 'bury the hatchet' means to stop fighting or arguing and establish friendly relations. Working on a 'trade agreement' is a sign of peaceful cooperation between countries. Option (c) is the correct definition. Option (a) is a literal interpretation. Options (b) and (d) are the opposite.

**Rule: Understanding Idiomatic Expressions.** The idiom 'get more than one bargained for' means to get something different and usually more negative or difficult than what one expected from a situation. Coaching children can often be more challenging than it first appears. Option (b) is the correct definition. Option (a) is a positive outcome, which is not the usual implication of this idiom. Option (c) is incorrect. Option (d) is a literal misinterpretation.

**Rule: Understanding Idiomatic Expressions.** The idiom 'out of sorts' means to be in a bad mood or to feel slightly ill. The inability to concentrate is a common symptom of feeling this way. Option (a) is the correct definition. Option (b) and (d) are literal misinterpretations of 'sorts'. Option (c) is the opposite.

**Rule: Understanding Idiomatic Expressions.** The idiom 'pull the plug' means to terminate or stop something from continuing. A project going over budget is a common reason for its cancellation. Option (c) is the correct definition. Option (a) is the literal action from which the idiom is derived. Options (b) and (d) are the opposite.

**Rule: Understanding Idiomatic Expressions.** The idiom 'on one's best behaviour' means to be as polite and well-behaved as possible, often because someone important is present. Children often behave exceptionally well for their grandparents. Option (a) is the correct definition. Option (b) is the opposite. Options (c) and (d) are unrelated behaviours.

**Rule: Understanding Idiomatic Expressions.** The idiom 'a leap in the dark' refers to a risky action taken with no prior knowledge of what the result might be. Investing in a new, unproven startup is a classic example of such a risk. Option (a) is the correct definition. Option (b) is a literal interpretation. Option (c) and (d) are the opposite.

**Rule: Understanding Idiomatic Expressions.** The idiom 'in a tight spot' (or 'in a tight corner') means to be in a difficult predicament with few options. Losing a key player would certainly put a sports team in a tough position. Option (c) is the correct definition. Option (a) is a literal interpretation. Option (b) and (d) are the opposite.

**Rule: Understanding Idiomatic Expressions.** The proverb 'don't look a gift horse in the mouth' is advice not to be ungrateful when you receive a gift by questioning its value. (The age and value of a horse can be determined by its teeth). The sentence advises the person to simply be grateful. Option (b) defines the action the proverb warns against. Option (a) is the literal origin. Option (c) and (d) are different responses to a gift.