plunge into

plunge into (third-person singular simple present plunges into, present participle plunging into, simple past and past participle plunged into)

1. A partial synonym of plunge in.
   • 1989, David Gale, The Theory of Linear Economic Models:

     Before asking the reader to plunge into the subject of linear models I shall, in accordance with a sensible custom, attempt in the few pages which follow to give some idea of what this subject is.

   • 2021 July 14, Pip Dunn, “Woodhead 40 years on: time to let go”, in RAIL, number 935, page 38:

     At 0508 on July 18 1981, the last freight train plunged into the 3-mile 66-yard Woodhead Tunnel at Dunford Bridge. [...] As it emerged back into the daylight at Woodhead at 0514, heading west, that was it for this famous railway line.

• “plunge into”, in Merriam-Webster Online Dictionary, Springfield, Mass.: Merriam-Webster, 1996–present.