(of a person) feeling warm, comfortable, and protected, or (of a place, especially a small place) giving feelings of warmth, comfort, and protection

We curled up in bed, all snug and warm, and listened to the storm outside. 我们蜷缩在床上，温暖又舒适，听着外面的暴风雨声。

I bet your feet are nice and snug in your fur-lined boots! 我敢说你的脚放在毛衬里的皮靴里又暖和又舒适！

fitting closely

These shoes are a bit too snug - do you have them in a larger size? 这双鞋有点儿太紧——你们有没有大一号的？

a small room or area in a pub where only a few people can sit