reign in
Advanced (C1)informal
to stop something from getting too strong or too much
"The company is trying to reign in unnecessary expenses."
Hear it in context

What Happened in the Persian Gulf War? | History
HISTORY · 0:25
from the start of his reign in 1979

Is This the The Lost City of Ramesses the Second? | Our History
Our History · 9:38
It was the longest reign in Egyptian history.

Democrats Are More Conservative Than Republicans?
Mr. Beat · 10:54
to actually reign in spending in recent years.

The American war machine, explained
Johnny Harris · 119:28
reign in the worst impulses of humans with power,

Did Pensions Destroy France?
Economics Explained · 12:12
in an effort to reign in France's spiraling deficit.