Buyers of options can either exercise their right to buy the underlying security or they can let the option expire wothless. A call over can take place throughout the life of the option until the exercise cut-off time that falls on the last trading day prior to the option contract's expiration.
the master called over the boys of the class - учитель сделал перекличку учеников
вызывать по списку; делать перекличку
the master called over the boys of the class - учитель сделал перекличку учеников