1 have a bee in one’s bonnet
2 kill two birds with one stone
3 bark up the wrong tree
4 take the bull by the horns
5 let the cat out of the bag
a be wrong about the reason for sth/how to do sth
b do sth difficult or risky in a determined and confident way
c tell people secret information, often without meaning to
d do two things at the same time using the effort needed to do only one.
e talk a lot about sth you think is important or interesting
1 A: We can drive past Sam’s place on our way to the doctor’s, so we can drop off his sleeping bag.
B: Good idea. We’ll be killing two birds with one stone!
2 A: Ollie thinks this path is the quickest way out of the forest.
B: No way! Tell him he’s barking up the wrong tree!
3 A: Nathan’s found out we are buying him a bike for his birthday.
B: I’m sure it was Janet who let the cat out of the bag. She’s not very good at keeping secrets.
4 A: Isabelle really has a bee in one’s bonnet about extreme sports.
В: I know. That’s all she ever talks about.
5 A: Don't worry about skydiving, just take the bull by the horns.
B: That’s easy for you to say! You’ve done it dozens of times before.