If and when we do take the plunge, the cause had better be worth it.
The forces already in play during the plunge would probably have made that impossible.
They help explain why more people were willing to take a plunge on purchasing home or buying a new car.
Why would someone in Ann's position want to plunge back into such a marathon?
Finally, I took the plunge after yet another plea that I give this “oh-so-realistic” series a try.
Her mind was unsettled: she could hardly recall anything except the plunge over the fall.
Why dost thou not plunge me forever into the depths of hell?
At twelve-ten plus forty-five seconds, he and his platoon were to "go over the top" and plunge into the inferno of No Man's Land.
It looks very horrible, but after the first plunge you do not mind.
I know into what an abyss I plunge myself; but, though prudence bids me conceal my passion, honor overpowers its precepts.
late 14c., "to put or thrust violently into," also intransitive, from Old French plongier "plunge, sink into; plunge into, dive in" (mid-12c., Modern French plonger), from Vulgar Latin *plumbicare "to heave the lead," from Latin plumbum "lead" (see plumb (n.)). Original notion perhaps is of a sounding lead or a fishing net weighted with lead. Related: Plunged; plunging. Plunging neckline attested from 1949.
c.1400, "deep pool," from plunge (v.). From late 15c. as "a sudden pitch forward;" meaning "act of plunging" is from 1711. Figurative use in take the plunge "commit oneself" is from 1845, from earlier noun sense of "point of being in trouble or danger" (1530s).
To bet or speculate recklessly (1876+)