Proverbs 30:32

30 a lion, mighty among beasts, refusing to retreat before anything;

31 a strutting rooster; a he-goat; and a king with his army around him.

If you have foolishly exalted yourself or if you have plotted evil, put your hand over your mouth.

33 For as the churning of milk yields butter, and the twisting of the nose draws blood, so the stirring of anger brings forth strife.”

Do read the surrounding verses too, because the context often says more than a single verse.

Compare

BSB
If you have foolishly exalted yourself or if you have plotted evil, put your hand over your mouth.
KJV
If thou hast done foolishly in lifting up thyself, or if thou hast thought evil, lay thine hand upon thy mouth.
WEB
“If you have done foolishly in lifting up yourself, or if you have thought evil, put your hand over your mouth.
ASV
If thou hast done foolishly in lifting up thyself, Or if thou hast thought evil, [Lay] thy hand upon thy mouth.
DARBY
If thou hast done foolishly in lifting up thyself, or if thou hast thought evil, [lay] the hand upon thy mouth.
BLB
If you have been foolish in lifting up yourself, and if you have schemed—hand to mouth!
ÅB
Har du vært så uforstandig at du har opphøyet deg, eller har du tenkt på ondt, da legg hånden på din munn!
OTB
Hvis du har vært tåpelig i å opphøye deg selv, eller hvis du har planlagt ondt, legg hånden over munnen.
B1930
Har du vært så uforstandig at du har ophøiet dig, eller har du tenkt på ondt, da legg hånden på din munn!

Study notes (Tyndale)

Original text and word study

Cross references