Here are some statements, have metaphorical meanings
break in the ice: prepare for something, or make it easy to do something
he looks blue: he looks sad
she's in the clouds: she's distracted
I'll go banan: I'll loose my mind, go crazy
it rains cats and dogs: it's raining hardly
this is nuts: it's bullshits
it's a piece of cake: it's an easy task
he leads a dog's life: his life is full of worries
he's a black sheep: he's an impolite person
this is a hot air: we talk useless
if I were in your shoes: if I were you
she's on her last legs: she's very tired
nice legs: good end of speech
I gave him the cold shoulder: I ignored him on purpose
he's a couch potato: he's lazy and spends all of his time on TV
he's a mouse potato: spends all of his time on computer
he's a dark horse: he's reticent
I'm over the moon: I'm very happy or pleased