It’s still too early for you to resign from your position as head softball coach.
Because the hiragana ends with an う sound, you know this word is a verb. The kanji itself means retreat, and the verb vocab version means to retreat, to withdraw or to resign.
Since this word consists of a kanji with hiragana attached, you can bet that it will use the kun'yomi reading. You didn't learn that reading with this kanji, so here's a mnemonic to help you:
You need to retreat from the battlefield because multiple Siris (しりぞ) have told you to. You don't know how the Siris know, but Siris know everything, so you and your army are trying to withdraw as quickly as possible. And once you do, you're planning to resign from the army for good.