
• (v. t.) To laugh (one) out of a purpose, principle, etc.; to discourage or discomfit by laughing; to laugh down. • (v. t.) To surpass or outdo in laughing.
Found on 
http://thinkexist.com/dictionary/meaning/outlaugh/
 Out·laugh'  transitive verb   1.
Out·laugh'  transitive verb   1.  To surpass or outdo in laughing. 
 Dryden.   2.  To laugh (one) out of a purpose, principle, etc.; to discourage or discomfit by laughing; to laugh down. [ R.] « His apprehensions of being 
 outlaughed will force him to continue in a restles...
Found on 
http://www.encyclo.co.uk/webster/O/44
  No exact match found.