The general meaning is: when the level of aggregate demand is too low, resulting in recession and unemployment, the government should take expansionary fiscal measures to stimulate demand; when the level of aggregate demand is too high, resulting in inflation, the government should take austerity measures to suppress aggregate demand.
I saw some answers that said "fiscal policy as well as monetary policy", but I don't think that's quite right. "Acting against the wind" is Keynesian demand management theory, and Proto-Caesarism is all about monetary policy being ineffective (because it's not). Proto-Keynesianism pays attention to short-run analysis), while fiscal policy is effective. So the emphasis should be on fiscal policy. Of course the answer to monetary policy should be uncontroversial as well. This is my own opinion.
I hope this helps.
Study hard!