To show the white feather

He went to his friend's house in the evening <u><em>as was his wont</em></u>.

To spill the beans

A fool's errand

He <u><em>passed himself off</em></u> as a noble man.

A green horn

Sachin <u><em>has bitten of more than</em></u> he can chew.

As a politician he is used to being <u><em>in the limelight</em></u> all the time.

To hang up one's hat