natychmiast bez wahania in inglese:

You can’t just resign at the drop of a hat.

if you do something at the drop of a hat, you do it immediately without stopping to think about it

If he proposed to her, she would definitely marry him at the drop of a hat.

If I knew what to do next, I'd quit my job at the drop of a hat. My wife's expecting a baby so I might have to rush to the hospital at the drop of a hat.

tłumaczenie przykładu ze słówkiem If I were you, I wouldn't give up at the drop of a hat.