burn your fingers
US /bɜrn jʊər ˈfɪŋɡərz/
UK /bɜrn jʊər ˈfɪŋɡərz/

1.
栽跟頭, 吃虧
to suffer unpleasant results of an action, especially by losing money
:
•
He burned his fingers badly in that risky investment.
他在那次高風險投資中栽了跟頭。
•
After trying to fix the car himself, he burned his fingers and had to pay even more for professional repairs.
在嘗試自己修車後,他栽了跟頭,不得不為專業維修支付更多費用。