'plunging down' is a correct and usable phrase in written English, referring to the action of falling or declining suddenly and rapidly.
Example sentence: The stock market saw prices 'plunging down' after the announcement.
He saw some of the men plunging down in flames.
But the NHS only reached that EU average briefly, before plunging down again.
"I shouldn't be doing this," I think, plunging down on the accelerator.
From the Old Dungeon Ghyll Hotel tucked into the fellside beneath a beck plunging down from the Langdale Pikes, we strode out to Pike O'Blisco.
Here it is, in all its pathetic plunging down from the sky, the collapsing umbrella of a sad and wind-buffeted eagle.
His hands become restless tools of emphasis, plunging down as he talks about lowering taxes and surging up as he assails the president for higher deficits.
Plunging down through the fog to the bridge at Stoke Flat, I passed beeches still holding their bronze leaves and a huge, venerable sycamore stripped bare.
But afterwards I was up for several days and it was only when they moved me to another ward that I came plunging down".
Household spending is plunging, down 6.6percentt in December from a year earlier, and the contraction in housing starts and construction orders is even worse.
Or was it, as Claire Tomalin wrote in the Independent, a "wheel that would not turn," or, in Hermione Lee's even harsher opinion, in the Observer, a novel that went "plunging down, on melting wings toward unreadability"?
Inside the building is more sober than the outside, but still grand, with an atrium plunging down from a glass barrel vault, criss-crossed by escalators, to a double height trading floor at the bottom.
