The blue-chip average dropped 670.25 points, or 1.55%, building on Monday's plunge of nearly 650 points. The Dow ended the session at 42,520.99. The S&P 500 dropped 1.22% and closed at 5,778.15 after notching its worst day of the year in the prior session. The Nasdaq Composite lost 0.35% and finished at 18,285.16.

US stocks slid Thursday and the S&P 500 closed in correction, down more than 10% from its record high in February, as President Donald Trump threatened new tariffs on the European Union.

A 10% drop is a big enough deal that professional investors have a name for it — a “correction” — and the S&P 500’s 1.4% slide on Thursday sent the index to its first si