She responded to me .....

Agreen with envy

Bknock socks off

CAt the drop of a hat

Dheavy heart


C. At the drop of a hat


At the drop of a hat=ഉടനെ

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Riya is at .............. since the death of her husband.

Bring out the meaning of the idiom in the following sentence :We shall fight "tooth and nail" for our rights.