ringdown

English

Etymology

ring +‎ down

Noun

ringdown (plural ringdowns)

(astronomy) The stage in a black hole merging event where the gravitational wave amplitude reaches its peak.
(telecommunications) A signal to a telephone operator that both rings a bell and allows a relay to drop.

Further reading

Binary black hole on Wikipedia.Wikipedia
Ringdown on Wikipedia.Wikipedia

Anagrams

drowning, wondring

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