Idiom
For each of the following sentences four alternatives are given. You are required to choose the correct meaning of the idiom or phrase given or underlined in the sentence. To oil the knocker

To revive old enmity
To instigate a person to do a job
To tip the office-boy
To do a work with increased pace

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Idiom
To disabuse one's mind

To banish from one's mind a thought
To remove a misapprehension
To conceal something
To proceed cautiously so as to avoid risks and dangers

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