A gift passifies an angry person.

Proverbs 21

21¹⁴ A gift in secret pacifieth anger, and a bribe in the bosom, strong wrath.

Amplified:

¹⁴ 
A gift in secret subdues anger,
And a bribe [hidden] in the pocket, strong wrath.

Complete Jewish Bible by David Stern:

¹⁴ A secret gift allays anger,
    and a bribe under the cloak the strongest fury.

1599 Geneva Bible:

¹⁴ A ^[i]gift in secret pacifieth anger, and a gift in the bosom, great wrath.

New Catholic Bible:

14 A gift given secretly appeases anger,
    and a gift concealed in the cloak will avert violent wrath.

The Living Bible:

14 ¹⁴ An angry man is silenced by giving him a gift!