Add Fuel to the fire: (to make things even more worse)
Shouting at the crying child added fuel to the fire.
At the Helm: (to be or serve at the top of sth)
He left the company two days ago after serving there at the helm.
To have a bee in one's bonnet: (keep talking about some very important thing)
She never stops talking about dieting - she's got a real bee in her bonnet about it.
Bad Debt: (a debt unlikely to be returned)
Don't lend him 1 lakh rupee, otherwise it will just be a bad debt.
To call a spade a spade: (to tell something truly,even if it's not liked by other)
America wouldn't call a spade a spade that Israel is committing brutality over Palestinians.
Confide in: (sharing matters with the trusted one)
Aslam shook his head, obviously contemplating whether it was wise to confide in Tahira.
Die-hard (conservative;committed;unwilling to leave ideas)
He is a die-hard fellow when it comes the stage of nationalism.
Ad lib: (said without any preparation or practice)
I'd forgotten the notes for my speech so I had to do it ad lib.
Iron Out: (to find solutions)
Kashmir is the jugular vein of Pakistan, so we have to iron it out soon.
Go by (to move past, in space or time)
Hardly a day goes by when I don't think about her.

__________________
"But screw your courage to the sticking place,
And we'll not fail." _Shakespeare, 'Macbeth')