0 to suddenly start doing something actively or enthusiastically:
Two months before his exams, he suddenly plunged into his studies.
He took a deep breath and plunged into his speech.
1 to suddenly start doing something in an active and enthusiastic way:
The Zurich insurance group has plunged headlong into fund management in America.
NOVÉ SLOVÁ
European
May 10, 2021
SLOVO DŇA
Shimmer
plunge in/plunge into sth