repeating a sound by bouncing it off surfaces, or repeating what someone else said.
From Greek 'ekho' (a sound reverberating). In mythology, Echo was a nymph whose voice could only repeat others' words—the sound phenomenon is named after her story.
The word 'echo' comes from a Greek myth where a nymph named Echo could only repeat what others said—and that mythological story actually *named* the physics phenomenon we experience in caves and canyons!
Complete word intelligence in one call. Free tier — 50 lookups/day.