Thanks to everyone, we could go to the quarter-finals of the Japan National High School Baseball Tournament held in Koshien stadium.
陰 is a shade or shadow. For some reason when you add お to shade it becomes "thanks to," as in "thanks to you, I was able to pass the test." Just think about a shade helping you out. Perhaps thanks to the shade you were able to survive the heat of the desert.
The reading comes from the word 陰. Thanks to that other vocab word, you can read this one!