Common "As...As" Idiomatic Expressions
1. Describing Physical Qualities and Traits
As light as a feather (very light)
The box looked heavy, but it was as light as a feather when I picked it up.
As strong as an ox (very strong)
My grandfather is 80, but he's still as strong as an ox.
As thin as a rake (very thin or skinny)
After his long illness, he was as thin as a rake.
As blind as a bat (unable to see well)
I'm as blind as a bat without my glasses.
2. Describing Character and Behavior
As cool as a cucumber (very calm and composed)
The pilot was as cool as a cucumber during the emergency landing.
As brave as a lion (very brave)
The young soldier was as brave as a lion on the battlefield.
As sly as a fox (very clever and cunning)
You have to watch out for that salesperson; he's as sly as a fox.
As stubborn as a mule (very unwilling to change one's mind)
I tried to get him to come with us, but he was as stubborn as a mule.
3. Describing Feelings and States of Being
As busy as a bee (very busy)
I have three projects due this week, so I'm as busy as a bee.
As hungry as a bear (very hungry)
I haven't eaten all day; I'm as hungry as a bear!
As happy as a clam (very happy)
Ever since she got her promotion, she's been as happy as a clam.
As sick as a dog (very sick)
After eating that old food, I was as sick as a dog.
As white as a sheet (very pale, usually from fear)
When she saw the spider, her face went as white as a sheet.
These expressions are great for making your descriptions more creative and vivid. Using them can help you sound more like a native speaker.