ringdown

== English == === Etymology === From 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, rownding