At the interbank foreign exchange market, the rupee breached the 63-mark against the dollar, today, tumbling 148 paise, its biggest single-day fall in a decade, to a record closing low of 63.13 against the dollar. During the session, the rupee had slipped to an all-time intra-day low of 63.30 to the dollar, weighed down by heavy dollar demand, and falling stocks markets