plunge something in

Từ điển Oxford Advanced Learner 8th

ˌplunge sth ˈin | ˌplunge sth ˈinto sth derived
to push sth quickly and with force into sth else
•Bring the water to the boil and plunge the vegetables in.
•She plunged the knife deep into his chest.
Main entry: ↑plunge_derived