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"echoing" is also used as a crossword clue. If that's what you saw, the answer is often resonant (8 letters).
Definitions
(of sounds) repeating by reflection
Used in a sentence
“The opposition of Popery there, is like the last echoings of the thunder dying upon the ear.”
Source: Wiktionary, CC BY-SA 4.0
Used as a crossword answer1 curated clues
01“Repeating a sound”7 letters
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