The idiom kept in the dark means not knowing anything. Here is an example.

“I have been kept in the dark about this project from the beginning. But I will surely find out what they are up to.”

Popularity: 43%

The idiom iron out means to solve something. It refers to using an iron to remove a wrinkle from clothing. Here is an example.

“We still have a few more things to iron out before we can close this contract.”

Popularity: 41%

The idiom in the bag means something not officially won will be won. It is often used by sales people to indicate that although they do not have a contract, they will get one. Here is an example.

John: Tim, how are you doing on this quarters sales?
Tim: Ok. I have closed 4 accounts and have another 3 in the bag.

Popularity: 34%

The idiom in good faith means to trust someone without a written document to support a promise. It is a religious reference in which a truly religious person would not lie. Here is an example.

“Let’s agree in good faith to implement all the actions we decided to do.”

Popularity: 31%

The idiom hard sell means to be difficult to convince. Here is an example.

“The product sounds great but given the competition, it is a hard sell.”

Popularity: 26%