Lack of fresh triggers and cautious sentiment ahead of monthly derivatives expiry on Thursday and and GDP data release on Friday also led to profit-booking, traders said.
After a steep rise of 387.69 points in the previous session, the Sensex dropped by 180.06 points, or 0.87 per cent, to end at 20,425.02 -- near day's lows.
ICICI Bank, ITC, HDFC and RIL were among laggards in the 30-share Sensex. However, gains in Tata Motors, HUL and BHEL capped its fall to some extent.
Investors churned portfolios ahead of the monthly futures and options (F&O) contract expiry on Thurday, analysts said.
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The rupee was looking up againt the US dollar as it traded at 62.44 compared to yesterday's close of 62.50. IT stocks, including TCS and Infosys, ended lower.
Oil rose ahead of a US supply report that might show an improvement in demand. Benchmark US crude for January delivery was up and trading around USD 94.5 a barrel.
Sectorally in the BSE, the Banking index suffered the most by losing 1.52 per cent. Oil and Gas index shed 1.23 per cent. In oil pack, besides RIL, others including ONGC, GAIL, BPCL, HPCL and IOC failed to sustain yesterday's gains.
PSU index, which contains some oil firms, was down 1.36 per cent. FMCG index declined 1.14 per cent, followed by Realty index (0.92 per cent).
Globally, stock markets traded sideways ahead of data release related to house prices and consumer confidence, and Thanksgiving holiday in the US.