Having nothing to do, he estivated the whole time unmindful of the summer escapades of others.    From LearnThat.org. 

Certain animals estivate.    From Wordnet, Princeton University. 

I am going to put a layer of leaf mold and ice cubes in the basement and estivate.    From Wordnik.com.  [Summertime ...] Reference

Other animals, such as lungfish and tortoises, burrow into the mud and estivate to survive.    From Wordnik.com.  [Mission Of Honor]

I'll bet snails can estivate for a really long time, especially desert forms that only rarely encounter damp conditions.    From Wordnik.com.  [Why I am sceptical of Brenda's story] Reference

A few freshwater mussels are known to estivate for a few years-Wendel Haag had a Uniomerus on his desk from when he found it until he finished his dissertation.    From Wordnik.com.  [Why I am sceptical of Brenda's story] Reference

They hibernate — they estivate and they hibernate — until the following January, when you will have forgotten what a pain it was to follow the show week after unrewarding week, and you'll be able to feel excited by the return of the boinging theme music, and the old panel of judges, who will file in wearily and act pained that they have to sit through it all again.    From Wordnik.com.  [I think I'm going to have to stop watching "American Idol."] Reference

I did not see any live Albinaria, which estivate on rock surfaces and are, therefore, easy to spot.    From Wordnik.com.  [SNAIL'S TALES] Reference

At first it looked like a vast blue fort or Valhalla; but when they began to tuck the coarse meadow hay into the crevices, and this became covered with rime and icicles, it looked like a venerable moss-grown and hoary ruin, built of azure-tinted marble, the abode of Winter, that old man we see in the almanac — his shanty, as if he had a design to estivate with us.    From Wordnik.com.  [Walden~ Chapter 16 (historical)] Reference

At first it looked like a vast blue fort or Valhalla; but when they began to tuck the coarse meadow hay into the crevices, and this became covered with rime and icicles, it looked like a venerable moss-grown and hoary ruin, built of azure-tinted marble, the abode of Winter, that old man we see in the almanac, -- his shanty, as if he had a design to estivate with us.    From Wordnik.com.  [Walden, or Life in the woods] Reference

They do not know whether to run, estivate, or start digging. ".    From Wordnik.com.  [Dirge]

I think I'll estivate.    From Wordnik.com.  [Threat of early summer] Reference

Time to estivate.    From Wordnik.com.  [Time to estivate] Reference

A design to estivate with us.    From Wordnik.com.  [Walden] Reference

08:39 am: Time to estivate.    From Wordnik.com.  [June 2008] Reference