Idiom

 Idiom is an expression with an abstruse (गूढ़ : hidden) meaning. The meaning of an idiom is somewhat different from its component words.

Dark Horse: (छुपा रुस्तम) A person whose quality is not yet recognised

A snake in the grass: (आस्तीन का सांप) A hidden enemy

Apple of someone's eye: (आँखों का तारा) A very lovable person.

Hang in the balance: (अधर में लटकना) to be left undecided

Between the devil and the deep blue sea: (आगे कुआँ पीछे खाई) to be in a dilemma, to fall between two big problems

[Note: There is one more idiom for this: Between Scylla and Charybdis means 'to fall between two equally dangerous situations'.]

See some interesting sentences with the above idioms:

Raaji is a dark horse for this championship.

Beware of him, he is a snake in the grass.

Every son is an apple of his mother's eye.

Many schemes of government hung in the balance.

When his mother and his wife start quarrelling, he is between the devil and the deep blue sea.

Write to Buddham, if you have any queries.