When something really good happens but it was completely unexpected.
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Deck the halls
To decorate one’s home with Christmas decorations.
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'Tis the season to be jolly
It means to be very, very happy during Christmas.
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Lit up like a Christmas tree.
To be overly dressed, just like Christmas trees which are usually bright, sparkly and full of decorative items.
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The proof is in the pudding
The success of something can only be judged by testing or using it.
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Don’t be left out in the cold
To be forgotten or left out.
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Eat, drink and be merry
Is used when telling others to enjoy themselves in the moment especially in a festive occasion like Christmas.
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Like turkeys voting for Christmas
Used when someone accepts a situation that will have a bad outcome for them.
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All my Christmases have come together
To experience an event of extremely good luck or happiness, something happened that you were dreaming about.
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To trim the tree
To add decorations to the Christmas tree like ornaments, ribbons, baubles, or lace.
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To ring in the New Year
To have a party on New Year’s Eve to welcome the New Year.
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Bah, Humbug
Scrooge, the main character of Charles Dickens’ novel used this term quite often. This expression is used in the context of someone who doesn't like Christmas.
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Christmas comes but once a year
Used as an excuse to overindulge, particularly regarding food and gifts.
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Skating on thin ice
You are said to be skating on thin ice when you place yourself in a precarious situation that may have disastrous consequences.
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Giving someone the cold shoulder
To ignore, be disrespectful or indifferent to someone.
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Don't look a gift horse in the mouth
You should never be ungrateful when you receive a gift or opportunity, even if it is not exactly what you want.