You can’t judge a book by its cover – don’t judge something on its appearance
Break a leg – good luck
When pigs fly – never going to happen
Feel under the weather – not feeling too well
Speak of the devil – when you’re talking about someone and they turn up
Shot in the arm – a boost or encouragement
Go broke – put every resource into something
A fish out of water – in an unfamiliar place or situation
A fly in the ointment – a small flaw that ruins everything
Cat got your tongue – speechless after a question
