To Appease
To Suppress, To Calm
transitive verb, ichidan verb
This word consists of kanji with hiragana attached. Because the hiragana ends with an う sound, you know this word is a verb. The kanji itself means tranquilize, so the verb version is what happens when you've already been able to tranquilize someone. It's to appease or to suppress.
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 want to appease her because she's (しず) SUPER mad. She's pissed and she's angry and she's going to beat you up if you don't find out how to calm her down!
神の怒りを鎮めるには、生贄を捧げる必要があります。
In order to appease the god’s anger we need to offer a sacrifice.