Definition of arb in English:

arb

noun

informal
  • short for arbitrageur
    • ‘If the arbs get into the conventional investment trust sector it will contract, absolutely.’
    • ‘In cash deals, the arbs often just buy the target.’
    • ‘The Merger Fund, the oldest arb fund, has delivered a 10.8% annualized return over the past 10 years, besting the average bond fund's 7.0% return with a comparable level of volatility.’

Pronunciation

arb

/ɑːb/