If you ~, you act quickly, often without thinking much about what you are doing.
The Government had to ~ and purchase millions of dollars worth of supplies.
PHRASAL VERB: V P
JUMP IN
Meaning of JUMP IN in English
Collins COBUILD. Толковый словарь английского языка для изучающих язык Коллинз COBUILD (международная база данных языков Бирмингемского университета) . 2012