deep discounter
noun [ C ]
ukus FINANCE
a person or company that buys and sells shares, currency, and other investment products at a much reduced price:
Generally speaking, deep discounters are simply the firms that charge the lowest commissions.
COMMERCE
a store that sells goods at prices that are very low compared to those in other stores:
German deep discounters such as Aldi and Lidl have made a significant impact on the British High Street.