great similes

hello, i want to share with you some similes and the meanings..

as a balt as a coot
=completely bald

as big as a bus
=very big

as black as a sweep
=completely  black

as blind as a bat
=completely blind

as calm as a millpond
=very calm and still

as white as a ghost
=very pale and white in the face

as sound as a bell
=very clear