The Dalal Street bears overpowered the bulls on Thursday, ahead of the Reserve Bank of India ‘s (RBI) monetary policy committee (MPC) meeting outcome scheduled to be announced on February 7. The BSE Sensex slipped 213.12 points, or 0.27 per cent, to close at 78,058.16 and Nifty 50 declined 92.95 points, or 0.39 per cent, to finish at 23,603.35.