1To become damp, moist, or humid; used for air or objects that are not dry.
外に干した洗濯物が、夜露でまた湿ってしまった。
The laundry hung outside got damp again from the night dew.
雨上がりで地面が湿っているから、足元に気をつけて。
The ground is damp after the rain, so watch your step.
梅雨の時期は押し入れの中まで湿ってくる。
During the rainy season, even the inside of the closet becomes damp.
2To lose energy or spirit, becoming gloomy or in low spirits; commonly used in the forms 湿っている/湿った.
決勝で負けてから、チーム全体の雰囲気が湿っている。
Ever since losing in the finals, the whole team's mood has been down.
彼は最近ずっと湿った顔をしていて、話しかけづらい。
He's had such a gloomy look lately that it's hard to talk to him.