A large number of buy or sell orders for a stock which causes an abnormally wide spread between bid and offer prices, and often causes the exchange to halt the sale of the stock until significant balance has been reestablished.
SIGNIFICANT ORDER IMBALANCE
Meaning of SIGNIFICANT ORDER IMBALANCE in English
Campbell R. Harvey. Hypertextual finance English glossary. Английский словарь гипертекстовых финансов. 2012