( informal ) to have the wrong idea about how to get or achieve sth :
You're barking up the wrong tree if you're expecting us to lend you any money.
( informal ) to have the wrong idea about how to get or achieve sth :
You're barking up the wrong tree if you're expecting us to lend you any money.
Oxford Advanced Learner's English Dictionary. Оксфордский английский словарь для изучающик язык на продвинутом уровне. 2005