The Federal Reserve's latest interest-rate hike will put a floor under their currencies and ease their efforts to control inflation. The greenback weakened across the board Thursday, resuming an downtrend that started in earnest six months ago, and allowing the South Korean won, for example, to soar more than 2% to 1-month high. Such moves should make imports cheaper, helping to moderate price pressures. Heading into the Fed decision, central banks across emerging Asia were already poised to slow their tightening cycles. Pulling off that task without undermining local currencies looks considerably easier with investors selling the dollar and betting а US banking crisis will see Fed rates peak out.