Complete the idiom (keep someone at a distance) “Once you suspect a person of double-dealing, you ought to keep him at arm’s ______.” Choose the correct word that completes the idiom.

Difficulty: Easy

length
distance
reach
end

Correct Answer: length

Explanation:

Given data

Idiom meaning: keep someone at a safe/hostile distance.

Concept/Approach
The fixed English idiom is “keep (someone) at arm’s length.”

Option analysis
length — correct set phrase.distance — similar meaning but not the idiom.reach/end — incorrect here.

Final Answer
length

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