Traders said the RBI's decision to lower the policy rate to 6 per cent failed to boost sentiment.
This is the first rate cut since October 2016 and the interest rate is now at a 6-year low.
They added that no change in cash reserve ratio (CRR) too had a bearing.
The 30-share index, which had retreated from record highs in late morning trade, was trading down 128.80 points, or 0.40 per cent, at 32,446.37 soon after the RBI announced its bi-monthly monetary review.
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The wider index Nifty too slipped from a record high by falling 45.95 points, or 0.45 per cent, to 10,068.70. The gauge had touched an all-time high of 10,137.85 at the outset today.
In the wake of record low retail inflation, the monetary policy committee (MPC) headed by RBI Governor slashed policy repo rate by 25 basis points to 6 per cent and reverse repo by a similar proportion to 5.75 per cent.
The central bank also retained the growth forecast at 7.3 per cent for the current fiscal.
However, the BSE realty index was 0.27 per cent down while auto shed 0.16 per cent.