<p><strong>Noun</strong></p><ul><li>Informal. Also <strong>oppo research</strong>.</li><li>opposition research: "She claims she never ordered oppo on the candidates."</li><li>an opponent or opponents; the opposition: "It's essential to get to know your oppo."</li><li>opposite: "I don’t know why she told you that when I really said just the oppo."</li><li>In this context, "sad" is the oppo of "fortunate."</li></ul><p><strong>Verb Phrase</strong></p><ul><li>Baseball Informal. to hit the ball uncharacteristically into the opposite field, which for a right-handed batter means hitting the ball into right field and for a left-handed batter means hitting the ball into left field: "The infield was expecting a shot between first and second, but the left-handed Lomak went oppo and drove one right through the hole near third base."</li></ul>