WordWeb Online

1. Remain secluded or in hiding
   "He is writing his book and is holing up in his study"
    
2. (golf) score a hole in one
    
3. Sleep during winter
   "Bears must eat a lot of food before they hole up in their caves";
   - hibernate

Derived forms: holed up, holing up, holes up

Type of: catch some Z's [N. Amer, informal], hide, hide out, rack up, score, sleep, slumber, tally

Antonym: aestivate