Idioms with AS...AS...

as solid as a rock
very calm or reliable
He stayed as solid as a rock throughout the crisis.

as fit as a fiddle
very healthy and strong
My grandfather is 80, but he’s as fit as a fiddle.

as clear as day
very easy to see or understand
It was as clear as day that he was not telling the truth.

as tough as nails
very tough and not easily frightened
She is friendly, but she is also as tough as nails at work.

as blind as a bat
unable to see well
He’s as blind as a bat, but he won’t wear glasses.