outlaugh

verb

1. (transitive)To ridicule or laugh someone out of a purpose, principle, etc.; laugh down; discourage or put out of countenance by laughing.

   “His apprehensions of being outlaughed will force him to continue in a restless obscurity. - Franklin”

2. (transitive)To laugh louder than, surpass in laughing.

   “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."”