Answer: hibernate

AnswerCrossword Clue
HIBERNATEConserve energy, in a way
HIBERNATEWhat bears do in winter.
HIBERNATEWinter.
HIBERNATEOne way to spend the winter
HIBERNATEEmulate a bear
HIBERNATEBurn off fat, perhaps
hibernateto pass the winter in a dormant state
hibernateto spend the winter in a dormant state