Churning

"Churning :

1. An unethical practice employed by some brokers to increase their commissions by excessively trading in a client's account. This practice violates the NASD Fair Practice Rules. It is also referred to as 'churn and burn', 'twisting' and 'overtrading'.

2. A period of heavy trading with few sustained price trends and little movement in stock market indexes.

Investopedia says: Another negative result for the client is being stuck with higher tax bills."