1. to spend the summer, as at a specific place or in a certain activity.
2. Zoology. to spend a hot, dry season in an inactive, dormant state, as certain reptiles, snails, insects, and small mammals.
So as the people we knew back East die, or are institutionalized, or take themselves off to Tucson or Sarasota or Santa Barbara to estivate their last years away as we are doing here, our contacts here shrink, too.
— Wallace Stegner , The Spectator Bird , 1976
Hibernate. Or estivate. Depends on whether I do so in the winter or the summer.
— Ian Watson , Lucky’s Harvest , 1993
Estivate derives from the Latin aestīvāre , with aestīvus meaning “relating to the summer.”