on the nose 正好，准时
Angela’s description of the cause of the car accident was right on the nose and made it easy for the police to establish what had actually happened.
One foot in the grave 离死不远
Old Jack, who is 90 years old, is very energetic and nobody thinks he has one foot in the grave.
Mona hopes when she has one foot in the grave, she can stay in the house with her family.
keep one’s fingers crossed 祝福成功，但愿好远
There is nothing we can do about the disaster at the moment. Let’s keep our fingers crossed.
George crossed his fingers and hopes for good grades in the coming exam.
Let one’s hair down 放松，毫无拘束
Linda always has a few drinks to let her hair down after work.
The new teacher tries to let everybody’s hair down by asking them to tell a joke before the test.