Half a mind
If you have half a mind to do something, you haven't decided to do it, but are thinking seriously about doing it.
Half-baked
A half-baked idea or scheme hasn't not been thought through or planned very well.
Hammer and tongs
If people are going at it hammer and tongs, they are arguing fiercely. The idiom can also be used hen people are doing something energetically.
Hand in glove
If people are hand in glove, they have an extremely close relationship.
Hand in hand
Hand in hand= work together closely When people in a group, say in an office or in a project, work together with mutual understanding to achieve the target, we say they work hand in hand. There is no lack of co-operation and each synchoranises the activity with that of the other.
Hand that rocks the cradle
Women have a great power and influence because they have the greatest influence over the development of children- the hand that rocks the cradle. ('The hand that rocks the cradle rules the world' is the full form.)
Hand to mouth
Someone who's living from hand to mouth, is very poor and needs the little money they have coming in to cover their expenses.
Hands down
If someone is better hands down than everyone else, they are much better.
Handwriting like chicken scratch
If your handwriting is very hard to read, it is like chicken scratch.
Hang by a thread
If something hangs by a thread, there is a very small chance indeed of it being successful or surviving.
Hang in the balance
If an outcome is hanging in the balance, there are at least two possibilities and it is impossible to predict which will win out.
Hang out to dry
If you hang someone out to dry, you abandon them when they are in trouble.
Hangdog expression
A hangdog expression is one where the person's showing their emotions very clearly, maybe a little too clearly for your liking. It's that mixture of misery and self-pity that is similar to a dog when it's trying to get something it wants but daren't take without permission.
Hanged for a sheep as a lamb
This is an expression meaning that if you are going to get into trouble for doing something, then you ought to stop worrying and should try to get everything you can before you get caught.
Happy medium
If you reach a happy medium, you are making a compromise; reaching a conclusion or decision.
Hard as nails
A person who is as hard as nails is either physically tough or has little or no respect for other people's feelings.
Hard by
"Hard by" means mean "close to" or "near".
Hard cheese
(UK) Hard cheese means hard luck.