Idiom
To be at loggerheads

To face stiff opposition
To have tough encounter
To be at enmity or strife
To tax one's mind and body

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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. I raked my brains to solve this difficult problem.

I used my common sense
I consulted several people
I read number of books
I brainwashed several experts
I subjected my mind to hard thinking

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