I felt like afish out of water among all those business tycoons.

Being an introvert, He will only eat his <u><em>heart out</em></u>.

Adam's ale

He is in the habit of <u><em>chewing the cuds</em></u>.

He believes in the policy of <u><em>making hay while the sun shines</em></u>.

Kunika was <u><em>cocksure</em></u> that she was able to do the job as desired.

To cool one's heels

Spick and span

<u><em>Once in a while</em></u> he might gamble a little.