In the following sentence, an idiom is highlighted. Choose the most suitable meaning of the idiom "blow off steam" as used in the sentence. Sentence: You must not waste your leisure time doing nothing, rather you should engage yourself in such activities that will blow off steam and recharge you for future endeavours.

Introduction / Context:
This question checks your understanding of the idiom "blow off steam" in a modern lifestyle context. The sentence talks about using leisure time in a productive way that helps you recharge. You must select the meaning that fits this context and matches the standard idiomatic usage.

Given Data / Assumptions:

• Idiom: "blow off steam".
• The sentence describes activities that help a person recharge during leisure time.
• Option A: Release surplus energy.
• Option B: Take steam bath.
• Option C: To make someone fidgety.
• Option D: To exercise the brain.

Concept / Approach:
The idiom "blow off steam" originates from steam engines, where excess steam had to be released to prevent pressure build up. In modern English, it means to release built up energy, stress, frustration or excitement in a harmless way, often through physical or enjoyable activities. It does not literally refer to taking a steam bath or making someone restless. Therefore, the correct meaning in this context involves releasing surplus energy or tension.

Step-by-Step Solution:
Step 1: Note the context of the sentence: using leisure time to engage in activities that recharge you for future work.Step 2: Understand that blowing off steam in this setting means releasing stress or extra energy so that you feel relaxed and refreshed.Step 3: Examine option A, "Release surplus energy". This matches the figurative sense of the idiom very well.Step 4: Examine option B, "Take steam bath". This is a literal interpretation not connected to the figurative idiom, and it does not fit all contexts where the phrase is used.Step 5: Examine options C and D. "To make someone fidgety" and "To exercise the brain" do not capture the idea of releasing built up tension. They instead suggest creating more restlessness or focusing on mental work only.

Verification / Alternative check:
Consider common sentences such as "He went for a run to blow off steam" or "After the exam, the students played games to blow off steam." In each case the phrase clearly refers to releasing accumulated stress or nervous energy, not to steam baths or mental exercises specifically. Therefore, "release surplus energy" is the best match among the options.

Why Other Options Are Wrong:
Option B wrongly treats the idiom as a literal phrase about steam. Options C and D completely change the meaning, focusing on causing restlessness or only on mental exercise. While exercising the brain can be part of a healthy lifestyle, it is not the specific idea expressed by this idiom in ordinary usage.

Common Pitfalls:
Some learners treat idioms literally and imagine the physical picture described by the words. However, idioms often have fixed figurative meanings that must be learned as complete units. For "blow off steam", always remember the image of safely releasing pressure from a system to avoid damage, similar to people releasing stress through hobbies or sports.

Final Answer:
The idiom "blow off steam" means to release surplus energy or tension, so option A is correct.