Explanation: Chickens are very timid, afraid or scared of many things. It is common to use animals to express traits such as "sly as a fox" or "strong as a bear."
There's nothing to be scared of. Don't be a chicken.
Everyone thinks I'm a chicken because I didn't go bungee jumping with them.
Stop being a chicken and just go."
A:
Did you ask Martha on a date?
B:
No. I was about to, but I got a little nervous.
A:
You're such a chicken.
Other Common Sentences
I didn't know you were afraid of insects. You're a scaredy cat.
He's a coward. He wouldn't even go on the rollercoaster ride.