1) Aestivate 2) Opposite of hibernate 3) Pass the summer 4) Relative of hibernate 5) Sleep 6) Sleep during summer 7) Slumber 8) Spend the summer 9) Stay inactive over the summer 10) Take a summer rental Found on https://www.crosswordclues.com/clue/estivate
estivation, aestivation, estivate, aestivate 1. Passing the summer or dry season in a dormant or torpid state. 2. The manner in which plant structures are folded prior to expansion or opening. Found on http://www.wordinfo.info/words/index/info/view_unit/768/