Definition: Against all the odds.Etymology: The story of David vs Goliath, is where a Jewish army and a Philistine army are separated by a valley. Since neither side wants to enter the valley and get slaughtered, they each decide to send one man. The Philistines send Goliath, a lumbering giant who requires an attendant and cannot see properly. David is selected from the Jews, he is fast and good with a sling and easily defeats Goliath who, modern archeologists suggest is suffering from Agro-megli.