Stem The Tide

An attempt to stop a prevailing trend. Sometimes referred to as "stop the bleeding."

Investopedia Says:
If a stock is continually falling, stemming the tide would be an attempt to halt the free fall and change its direction.

Stop the course of a trend or tendency, as in It is not easy to stem the tide of public opinion. This idiom uses stem in the sense of "stop" or "restrain." [Mid-1800s]