But having gained more than 4 percent against the Japanese currency in six days, the dollar stalled on Monday, slipping 0.7 percent after BOJ Governor Haruhiko Kuroda's comments, to 103.27 yen.
Though Kuroda signaled his readiness to further expand an already massive stimulus program, he did not provide the explicit hints that some had been waiting for on the chances of the BOJ aggressively easing policy at its next review on Sept. 20-21, traders said.
From Zurich, UBS's head of currency strategy Constantin Bolz said the factors that had driven the yen higher - growing expectations of a Fed hike in September, bets on imminent further BOJ easing, and increased risk appetite -had faded somewhat, but that a fall-back was not surprising given the rapidity of the move.
"We shouldn't forget that we were at 100 yen ten days ago," Bolz said.
"The (U.S.) labour market wasn't great ... so that took out a bit of steam from the dollar side, and then Kuroda didn't say anything too clear about further easing at the end of September and so now markets have to level out their bets a little bit."
Data from the U.S. Commodity Futures Trading Commission released on Friday showed that currency speculators increased their bets on the yen in the week ending Aug. 30, but had cut their long U.S. dollar bets to an 8-week low.