- a home truth
- a honeymoon period
- a hornet’s nest
- a hostage to fortune
- a hot line
- a hot line (to sb)
- a hot line to sb
- a hot potato
- a hot spot
- a household name
- a household name/word
- a household word
- a house of cards
- a hue and cry
- a hundred and one things to do etc.
- a hundred per cent
- a hundred/thousand/million and one things/things to do etc.
- aid
- aim
- air
- airs
- airs and graces
- aisle
- aisles
- A is one thing B is another