High-flying South Korean equities slid sharply from an all-time high on Tuesday morning as investors dumped chip heavyweights amid growing concern that the rally had grown overstretched. The Kospi deepened its losses to 8.3%, with SK Hynix Inc. shedding more than 11% and Samsung Electronics Co. falling over 8%. Korea Exchange suspended trading for 20 minutes, activating market circuit breakers that have been triggered with greater regularity this year.