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estivate (v.)[estivate 词源字典]: "to spend the summer," 1650s, from Latin aestivatus, past participle of aestivare "to spend the summer," from aestus "heat," aestas "summer," literally "the hot season," from Proto-Italic *aissat-, from PIE *aidh- "to burn" (see edifice). Related: Estivated; estivating; estivation.[estivate etymology, estivate origin, 英语词源]