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.’
- sing-jaying
- single
- single acrostic
- single-acting
- single-action
- single blessedness
- single-blind
- single bond
- single-breasted
- single carriageway
- single-cell protein
- single combat
- single-copy
- single cream
- single currency
- single-cut
- single-decker
- single digging
- singledom
- single-elimination
- single end
- single-ended
- single-entry
- Single European Act
- single European currency