To Wet
To Moisten, To Dampen, To Soak
transitive verb, godan 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 wet or damp, so the verb version is to wet or to dampen something.
Since this word consists of a kanji with hiragana attached, you can bet that it will use the kun'yomi reading. You learned this reading with the kanji, so you should be able to read it already!
髪をよく濡らしてから、シャンプーをするといいですよ。
It's good to wet your hair before shampooing.
大事なUSBなので、コーヒーや水で濡らさないで下さいね。
This USB is important, so please be careful not to get it wet with coffee or water.
先輩にフラれてから、毎日涙で枕を濡らしています。
Since I was dumped by my senpai, I've been soaking my pillow with tears.