Being an introvert, He will only eat his heart out.

To take somebody for a ride

Govind has left his country <u><em>for good</em></u>.

To cry wolf

He is <u><em>not worth his salt</em></u> if he fails at this juncture.

My plan to have a new car <u><em>fell through</em></u> because of the price rise.

He fell <u><em>ill at ease</em></u> after receiving the letter from his son.

I am sure he <u><em>means business</em></u>.

Mohan always <u><em>keeps himself to himself</em></u>