1. To secure the equipment, gear, or parts of a ship or other seafaring vessel that could be damaged or blown away in preparation for an oncoming storm. In this usage, a noun or pronoun can be used between "snug" and "down." We scrambled to snug down the sailboat as the wind and rain began to intensify. I found myself wishing I had my wife with my to snug the yacht down at the end of the day.

2. To settle into a very warm, comfortable, cozy position. When I was in my twenties, I loved to go out to parties on Friday nights, but now I'm happy to just snug down in front of the TV with a good movie.