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excavate (v.)

"to hollow out, make hollow by digging or scooping, or by removing extraneous matter," 1590s, from Latin excavatus, past participle of excavare "to hollow out," from ex "out" (see ex-) + cavare "to hollow, hollow out," from cavus "cave" (from PIE root *keue- "to swell," also "vault, hole"). Related: Excavated; excavating.