with guns blazing
US /wɪθ ɡʌnz ˈbleɪzɪŋ/
UK /wɪθ ɡʌnz ˈbleɪzɪŋ/

1.
意気揚々と, 猛烈な勢いで
with great energy, enthusiasm, or aggression
:
•
He entered the competition with guns blazing, determined to win.
彼は意気揚々と大会に臨み、勝利を誓った。
•
The new CEO came into the company with guns blazing, making immediate changes.
新しいCEOは猛烈な勢いで会社に入り、すぐに変更を加えた。