うまい話はなしには裏うらがある

expression, godan verb (-ru, irregular)

if it sounds too good to be true, it probably is; there's a flip side to every coin

Proverb warning that an offer or story that seems very advantageous likely has a hidden catch or downside.

• うまい話はなしには裏うらがあるから、簡かん単たんに儲もうかるという誘さそいには気きをつけたほうがいい。

  If it sounds too good to be true, it probably is, so you should be careful of offers that promise easy money.

• 彼かれの提てい案あんはうまい話はなしに聞きこえたが、やはり裏うらがあった。

  His proposal sounded like a great deal, but sure enough, there was a catch.