Simple past tense and past participle of estivate.(verb)
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Use "estivated" in a sentence
"Seas were less affected than land, and many shore-based animals that ate marine species neither hibernated nor estivated."
"Water pressure dropped with the level; lower temperatures meant a higher equilibrium concentration of dissolved oxygen, which affected the fairly shallow depths at which the People estivated; current shifted, altering the local content of minerals raised from the ocean bed."