major traffic jam; huge congestion; complete gridlock
Describes a very severe traffic jam, often on highways or major roads, where movement is nearly impossible.
On the first day of the long holiday, the expressway was completely gridlocked.
Due to an accident, the city center was caught in a massive traffic jam.
Compound of 大 (だい, 'big, great') and 渋滞 (じゅうたい, 'traffic jam, congestion').