Indonesia's central bank said the rupiah's fall against U.S. dollar was still under control, after the currency slid to its weakest level in more than six months on Thursday following a surprise cut in interest rates the day before.

The surprising decision by the BOK and BI underscores challenges faced by Asian central banks as they try to spur growth and defend their currencies against a towering dollar while preparing for tariffs from the incoming administration of U.S. President-elect Donald Trump.

The Indonesian rupiah stayed near six-month lows on Thursday, while the South Korean won snapped a three-day winning streak after both countries' central banks shocked investors by eschewing widely anticipated interest rate calls.

INDONESIA’S rupiah fell to its lowest in more than five months on Wednesday ahead of the central bank’s monetary policy decision later in the day, while the Thai baht stalled around a seven-week low as dollar remains dominant.

Indonesia’s central bank caught markets off guard with a surprise rate cut, upending expectations that it would keep policy settings on hold to help stabilize the rupiah.