plunge in

Từ điển Oxford Advanced Learner 8th

ˌplunge ˈin | ˌplunge ˈinto sth derived
1. to jump into sth, especially with force
•The pool was declared open and eager swimmers plunged in.
2. to start doing sth in an enthusiastic way, especially without thinking carefully about what you are doing
•She was about to plunge into her story when the phone rang.
•He's always plunging in at the deep end (= becoming involved in difficult situations without being well enough prepared).
Main entry: ↑plunge_derived