I sweat a lot when I was sleeping last night and my bed is a little damp.
Because the hiragana ends with an う sound, you know this word is a verb. The kanji itself means damp so the verb vocab version is to be damp or to be moist. Ewww.
You have to think of something that's damp and moist. To do that, think of He-Man's girlfriend, She-Man (しめ). She has been hanging out in a greenhouse and is now kind of damp. He-Man hands her a towel to dry off.