These predictions come as top economic policymakers gather in Washington for the spring meetings of the International Monetary Fund (IMF) and the World Bank, APA reports citing BBC.
Pierre-Olivier Gourinchas, the IMF's chief economist, says the global economy "still bears significant scars" from the "severe shocks of the past four years".
"It is now being severely tested once again," he adds.
Uncertainty around trade policy was a "major factor" behind the growth downgrades, Gourinchas says.
"Faced with increased uncertainty... many firms' initial reaction will be to pause, reduce investment and cut purchases."