The phrase "to find the opposite" means to look for something that is completely different or contrary to what you currently have or know. Full definition
Many second time parents have actually found the opposite with baby number and they tend to arrive an average of 3 days after their due date. (bounty.com)
However, other studies find the opposite, and that it is better to introduce foods early, as waiting can increase the chance of a food allergy. (babygaga.com)
Neither the gay person nor the straight single is able to find an opposite sex partner. (redeeminggod.com)