Albert Barnes Commentary Proverbs 30:33

"For the churning of milk bringeth forth butter, And the wringing of the nose bringeth forth blood; So the forcing of wrath bringeth forth strife." — Proverbs 30:33 (ASV)

Churning ... wringing ... forcing - In the Hebrew text it is one and the same word. “The pressure of milk produces curds, the pressure of the nose produces blood, the pressure of wrath (that is, brooding over and, as it were, condensing it) produces strife.”