Etymology
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estivate (v.)

also aestivate, "to spend the summer," 1620s, from Latin aestivatus, past participle of aestivare "reside during the summer" from aestus "heat," aestas "summer," literally "the hot season," from Proto-Italic *aissat-, from PIE *eidh- "to burn" (see edifice). Related: Estivated; estivating; estivation.

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Definitions of estivate

estivate (v.)
sleep during summer;
certain animals estivate
Synonyms: aestivate
From wordnet.princeton.edu