Muddy Water
noun
Mud water is muddy water. Don't step in it, if you can help it.
This is a jukugo word that uses the kun'yomi readings of the kanji. You should be able to read this on your own.
There's another way to read this word that uses both on'yomi readings (でいすい). It's mostly used in more formal or technical situations though, so we're focusing on the どろみず reading here!
「ちょっと！今私の雑誌にコーヒーをこぼしたでしょ？」「ああ、ごめん！悪かったよ。」「あ〜ぁ〜…ジョニーデップの股間のところに泥水みたいな染みができちゃったじゃない！」
"Hey! Did you spill coffee on my magazine?" "Ah, sorry! My bad!" "Aww... now it looks like there is a muddy water stain right on Johnny Depp’s crotch."