From Longman Business Dictionarychurningchurn‧ing /ˈtʃɜːnɪŋ-ɜːr-/ noun [uncountable] informal FINANCE when a STOCKBROKER buys and sells different investments for their clients more often than they should, in order to increase the amount of COMMISSION they earnHe will consider increasing taxes on short-term trades as a way to discourage churning of stocks.