come out swinging

US /kʌm aʊt ˈswɪŋɪŋ/
UK /kʌm aʊt ˈswɪŋɪŋ/
"come out swinging" picture
1.

to immediately respond to a situation or argument with great force or aggression

:
When he was accused of cheating, he immediately came out swinging, denying all allegations.
The new CEO decided to come out swinging with a bold new strategy to turn the company around.