The situation in which a customer ' s account is liquidated ( open positions are offset ) by the brokerage firm holding the account ， usually after notification that the account is undercapitalized ( margin calls ) 通常指一个账户在被发出追加保证金的通知(而未能按时补足)的情况下，管理该客户账户的经纪公司对账户中的持仓进行平仓的行为。
