Dictionary.net

sleep during winter, as of certain animals; "Bears must eat a lot of food before they hibernate in their caves"

remain secluded or in hiding; "He is writing his book and is holing up in his study"

score a hole in one, in golf

remain secluded or in hiding; "He is writing his book and is holing up in his study"

sleep during winter; "Bears must eat a lot of food before they hibernate in their caves"