heavy hitter 
(also big hitter)
noun informal
An important or powerful person: its membership includes many heavy hitters in the insurance industry...
- Neither do we include Wall Street big hitters who spend time in London.
- Usually these are big hitters and we're looking at investors with €500,000 and upwards, ‘he said.’
- He said: ‘What I think is superb about this campaign is the big hitters of the industry in this town have signed up to it.’
- aphrodisiacal
- Aphrodisias
- Aphrodite
- aphtha
- aphthous
- aphthous fever
- API
- Apia
- apian
- apiarian
- apiarist
- apiary
- apical
- apices
- Apicomplexa
- apicomplexan
- apicultural
- apiculture
- apiculturist
- apiece
- a piece of ass (or tail)
- a piece of cake
- a piece of old tackie
- a piece of piss
- a piece (or slice) of the action