I looked it up because my memory of its meaning was a bit different. I remembered it as having a payback/revenge aspect. The difference in the translations of this are striking.
DJC
A fool uttereth all his mind: a wise man deferreth, and keepeth it till afterwards.
King James Version
A fool uttereth all his mind: but a wise man keepeth it in till afterwards.
New Interntional
Fools give full vent to their rage, but the wise bring calm in the end.
Wycliffe
A fool bringeth forth all his spirit; a wise man delayeth, and reserveth into (the) time (to) coming afterward.
Jack of Clubs, mirror image, proverbs 29:11
I looked it up because my memory of its meaning was a bit different. I remembered it as having a payback/revenge aspect. The difference in the translations of this are striking.
DJC
King James Version
New Interntional
Wycliffe
https://www.biblestudytools.com/proverbs/29-11-compare.html