Understanding the Idiom "Racked His Brain"

The sentence provided is "Mr. Raghav racked his brain, but couldn't think where he had left the book." We need to find the most appropriate phrase to substitute the underlined segment, which is "racked his brain."

The phrase "to rack one's brain" is a common English idiom. Idioms are phrases or expressions whose meaning cannot be deduced simply by knowing the literal meaning of the words in the phrase.

Meaning of "Racked His Brain"

The idiom "to rack one's brain" means to think very hard about something, typically in an attempt to remember something or to find a solution to a problem. The word "rack" here suggests straining or stretching, like a torture device called a rack, implying intense mental effort.

Analyzing the Sentence Context

In the given sentence, Mr. Raghav "racked his brain" because he "couldn't think where he had left the book." This context clearly indicates that he was putting in a lot of mental effort trying to remember the location of the book, but was unsuccessful.

Evaluating the Options for Phrase Substitution

Let's examine each option to see which one best fits the meaning of "racked his brain" in the context of the sentence:

1. thought very hard: This option directly matches the core meaning of the idiom "racked his brain," which is to think intensely or with great effort. In the context, Mr. Raghav was thinking very hard to remember where the book was.
2. had a series of consecutive thoughts: This option simply describes the process of thinking in a sequence. It does not imply any particular level of effort or difficulty in the thinking process. Thinking often involves a series of thoughts, but "racking one's brain" is more than just consecutive thinking; it's difficult, intensive thinking.
3. knew it, but couldn't quite remember it: This option describes a state of mind where information is known but inaccessible for recall. While this state might lead one to rack their brain, it is the outcome or condition, not the action of "racking one's brain" itself. The idiom describes the effort made to remember, not the fact of knowing and being unable to recall.
4. thought he had heard something before: This option relates to the feeling of recognition or déjà vu. It is not relevant to the act of intensely trying to remember where an object was left.

Identifying the Most Appropriate Substitute

Comparing the options, "thought very hard" is the phrase that most accurately captures the meaning of "racked his brain" in the context of trying to remember something. It reflects the intense mental effort described by the idiom.

Based on the analysis, the most appropriate option that can substitute the underlined segment "racked his brain" is "thought very hard".

Revision Table: Key Idioms and Meanings

Understanding common idioms is crucial for language proficiency. Here are a few examples:

Additional Information: Idioms and Vocabulary

Idioms are an important part of English vocabulary. They add richness and colour to the language. Learning idioms can significantly improve comprehension and expression skills, which is beneficial for both everyday communication and competitive exams.

• Many idioms have historical origins that help explain their meaning.
• Context is key when interpreting idioms. The same phrase might have slightly different nuances depending on how it is used.
• Practicing with idiom exercises and using them in sentences helps solidify understanding.