Mumbai, Nov. 18 -- The Dow tumbled 557.24 points (1.2%) to 46,590.24, the Nasdaq slid 192.51 points (0.8%) to 22,708.07 and the S&P 500 slumped 61.70 points (0.9%) to 6,672.41.

Wall Street weakened as valuation worries resurfaced ahead of Nvidia's quarterly earnings, with the company's stock dropping 1.8%. Investors are anxious that Nvidia's results and outlook will determine whether the AI-driven market momentum can continue or if fears of a tech bubble will intensify. Analysts caution that simply meeting expectations won't suffice-Nvidia must deliver a strong beat to sustain confidence in the sector.

Meanwhile, U.S. traders focused on delayed economic data following the government shutdown. Construction spending unexpectedly rose in A...