What generous four-character idiom?

Laughing generously is to make people in the circle laugh.

Natural and graceful: frank and cheerful. Describe a natural and generous manner.

Make people laugh: make people laugh; Generosity: originally refers to people who know the avenue, and later refers to people who have knowledge or expertise. Make the insiders laugh.

Generosity means making people laugh. "Laugh and be generous".

Be generous, not tacky, not artificial. Describe people's behavior without restraint, honest and frank.

Generosity means making experts laugh. With a "generous smile".

Laughing means making experts laugh.