Here is a list of idiomatic expressions built around words beginning with the letter D.
Be at daggers drawn
When you are at daggers drawn, you are extremely hostile.
Dally with
To dally with someone is to have a casual romantic or sexual relationship with them.
A big deal
A big deal is an important thing.
Deal someone a blow
To deal someone a blow is to be harmful to them.
A great deal of
A large amount of
A square deal
A square deal is a fair treatment.
At death’s door
When someone is at death’s door, they are so ill that they may die.
Die a death
To die a death is to fail.
In deep water
When you are in deep water, you are in trouble.
Be thrown in at the deep end
When you are thrown in at the deep end, you are forced to face a difficult situation with hardly any experience.
Detach yourself from
To detach yourself from something is to distance yourself from it.
Between the devil and the deep blue sea
When you are between the devil and the deep blue sea, you are in a dilemma.
Devil-may-care
Reckless and cheerful
Die down
When something dies down, it becomes less strong or loud.
The noise died down.
Be dying for
When you are dying for something you are eager to have it.
Die hard
An expression used to refer to situations that change slowly.
Old habits die hard.
Never say die
Someone who has a never say die spirit, do not give up hope.
Dig something out
To dig something out is to discover facts.
Dig in your heels
To dig in your heels is to refuse to do something.
Take a dim view of
To take a dim view of something is to regard something with disapproval.
Dish something out
To dish something out is to distribute something in a casual way.
At someone’s disposal
When you have something at your disposal, it is available for you whenever or however you wish.