Directions: For each of the following sentences four alternatives are given. You are required to choose the correct meaning of the idiom or phrase given underlined in the sentence.
He is a queer fish. i have failed to understand him.
» Explain it
A queer fish:
A person whose behaviour seems strange or unusual.
Ex. They have invariably chosen the queer fish in preference to the more or less recognizable member of the human race.

Option C is the correct answer.

The involvement of teacher in the scheme of education proved to be a mare's nest.
» Explain it
A mare's nest:
An idea or a discovery that seems interesting and exciting but is found to be false or have no value.

Ex. I fancy this will prove to be a mare’s nest! We have had these mysteries before.

Ex. In a global socio-economic order dominated by the striving for private profit, together with the divergent aims of capitalist nation-states and imperialist great powers, the project has already become a mare’s nest of conflicting interests.

Option A is hence the correct answer.

Chandu used very ugly words against his kind uncle. He threw down the gauntlet before him.
» Explain it
To throw down the gauntlet:
To challenge someone to an argument, tdeclare or issue a challenge

Ex. The senator threw down the gauntlet on the abortion issue. 

Ex. Just as much as SP and BSP have thrown down the gauntlet in Gorakhpur and Phulpur, the BJP with its unmatched money and muscle power and the state machinery at its disposal will leave no stone unturned to hold on to these seats.

Option B is hence the correct answer.

The present undergraduate syllabus leaves very little elbow room for teachers to be innovative.
» Explain it
Elbow room:
The freedom and ability to act as one wants.

Ex. If you're worried about her having too much elbow room as student council president, you should impose limitations.

Ex. KCR is now banking on the feeling of resentment among many states that too many powers are vested at the Centre, giving them little elbow room. 

Option C is hence the correct answer.
The members of the group were at odds over the selection procedure.
» Explain it
At odds:
in conflict or at variance.
Ex. His behaviour is at odds with the interests of the company.
Similar Idioms: in conflict, in disagreement, on bad terms, at cross purposes, at loggerheads, etc.

Option B is hence the correct answer.