transitive verb. To remove from a list, especially from a list of securities traded on a stock exchange.

verb. To remove from an official register or list.

verb. remove (a security) from listing at a stock exchange

"Earlier in 2008, the U.S. Court of Appeals for the District of Columbia Circuit issued an opinion in a case that was initiated by 15 states and other groups, challenging the EPA's decision to "delist" mercury as a hazardous air pollutant."