plunge into

US /plʌndʒ ˈɪntuː/
UK /plʌndʒ ˈɪntuː/
"plunge into" picture
1.

投入, 陷入

to suddenly start doing something or become involved in something, often without careful thought

:
He decided to plunge into the new business venture without hesitation.
他决定毫不犹豫地投入新的商业冒险。
After graduation, she will plunge into a demanding career.
毕业后,她将投身于一份要求很高的职业。