| Idiom | Meaning | Example | 
| wreak havoc | 
damage, destroy, lay waste, trash the place
 | 
If the workers get mad, they'll wreak havoc in the warehouse. They'll wreck the place.
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| write it off | 
say it is a financial loss, call it a business expense, deduct it from income
 | 
Don't worry about the cost of  my plane ticket. I can write it  off as a business expense.
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| write up | 
record in writing, prepare a written account
 | 
I've been asked to write up a list of the winners for the newspaper.
 | 
| writer's block | 
being unable to think of something to write
 | 
I told the teacher I couldn't do the paper because of writer's block.
 | 
| written all over your face | 
showing on your face, body language, read you
 | 
When you heard that Italy lost the World Cup, disappointment was written all over your face.
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| written in blood | 
like a law, binding, cannot be changed
 | 
Now that his name is written in blood, he's a member of our gang.
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| written in stone | 
written in final form, like a commandment
 | 
Our agreement isn't written in stone; it can be changed.
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| wuss | 
weak person, chicken, wimp
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"Who is the most famous wuss?" "Mr. Bean?" "Right!"
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| wysiwyg | 
what you see is what you get (if you are lucky)
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The printer is supposed to print what you see on the computer screen - wysiwyg!
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