What does it mean?
To feel ill

How do you use it?
If someone says they’re feeling under the weather, your response should be ‘I hope you feel better!’,

What does it mean?
 It’s up to you

How do you use it?
 It’s your move now, but this idiom refers to life rather than a sport. If you’ve got the ‘ball,’ the decision is yours and someone is waiting for your decision. 

What does it mean? No matter what

How do you use it? You guarantee to do something, regardless of the weather or any other situation that might arise. ‘I’ll be at your football game, come rain or shine’.

What does it mean?
To give away a secret

How do you use it?
 If you told someone about their own surprise party, you’d have ‘spilled the beans’ or even ‘let the cat out of the bag’. The secret is out. 

What does it mean? 
To wish someone luck

How do you use it?
This idiom is not at all threatening. Often accompanied by a thumbs up, ‘Break a leg! ’is an encouraging cheer of good luck. It originates from when successful theater performers would to bow so many times after a show that they would break a leg. 

What does it mean?
To play a practical joke

How do you use it?
 This is the perfect phrase to learn if you’re a fan of practical jokes. ‘Pull their leg’ is similar to ‘wind someone up’. Use it in context: ‘Relax, I’m just pulling your leg!’ or ‘Wait, are you pulling my leg?’.

What does it mean?
To be undecided

How do you use it? 
If you’re sat on the fence, you’ve not decided which side of an argument you agree with. 
‘I’m on the fence about hot yoga classes,’ translates as ‘I’m not sure whether I enjoy yoga in a sauna yet.’ 

What does it mean?
To be loyal no matter what

How do you use it?
 Often used to describe families or BFFs, ‘through thick and thin’ means that you’re by each other’s side no matter what happens, through the bad times, as well as the good. 

What does it mean? 
Rarely

How do you use it? 
This charming phrase is used to describe something that doesn’t happen often. Example: ‘I remember to call my parents from my study abroad trip once in a blue moon.’

What does it mean?
That’s true

How do you use it?
 Generally exclaimed in agreement. When a friend says ‘Ryan Reynolds is gorgeous!’, you can reply ‘You can say that again!’