outlaugh
To ridicule or laugh someone out of a purpose, principle, etc.; laugh down; discourage or put out of countenance by laughing.
transitive
His apprehensions of being outlaughed will force him to continue in a restless obscurity. - Franklin
To laugh louder than, surpass in laughing.
transitive
At his father's quick guffaw he jumped back, trying to outlaugh him. "Mamma, did you hear what I said, Mamma?" Boardman felt his side. "My boy, that's a good one."
Where it comes from
From out- + laugh. Compare Saterland Frisian uutlachje, West Frisian útlaitsje, Dutch uitlachen (“to ridicule”), German Low German utlachen, German auslachen (“to laugh at”), Danish udle.
Adapted from the Wiktionary entry outlaugh (CC BY-SA 4.0).