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 because she re-zoned (しりぞ) where you are standing. Now this is a no standing zone. Who is she? The re-zoner, duh.
It’s still too early for you to resign from your position as head softball coach.