English Idioms and Idiomatic Expressions 

COMPARISONS - SIMILARITY, page 1

Idioms relating to comparisons and similarities
from:  'as blind as a bat'   to:  'as fit as a fiddle'

• as blind as a bat
  • Someone whose vision is very poor, or who is unable to see anything, is (as) blind as a bat.
    "Without his glasses, the old man is as blind as a bat."
    
    
• as bold as brass
  • Someone who is as bold as brass has a lot of self-confidence and can act in a way that may seem rude to others.
    "He interrupted the meeting and, as bold as brass, queried the veracity of the speaker’s claims."
    
    
• as broad as it's long
  • This expression means that there is no real difference which alternative is chosen.
    "Take the high-speed train, or fly and take a taxi? It's as broad as it's long."
    
    
• as busy as a bee
  • If someone is as busy as a bee they are very active and have a lot of things to do.
    "Tom is as busy as a bee getting everything ready for the exhibition."
    
    
• as clean as a whistle
  • Something as clean as a whistle is extremely clean.
    (This can also mean that a person's criminal record is clean.)
    "Bob spent the afternoon washing and shining his car until it was as clean as a whistle."
    
    
• as close / as dumb as an oyster
  • Someone who is as close or as dumb as an oyster will never reveal something told in confidence or betray a secret
    "Sophie will never repeat what you tell her. She's as dumb as an oyster."
    
    
• as cool as a cucumber
  • A person who is as cool as a cucumber is not anxious, but relaxed and non-emotional
    "The bride's mother stayed as cool as a cucumber all through the ceremony."
    
    
• as crooked as a dog's hind leg
  • To say that someone is as crooked as a dog's hind leg means that they are very dishonest indeed.
    "That guy can't be trusted - he's as crooked as a dog's hind leg."
    
    
• dead as a dodo
  • To say that something is (as) dead as a dodo means that it is unquestionably dead or obsolete, or has gone out of fashion.
    (A dodo is a bird that is now extinct.)
    "The floppy disk is an invention that is now (as) dead as a dodo."
    
    
• dead as a doornail
  • This expression is used to stress that a person or thing is very definitely dead.
    "They've started fighting again, so the peace agreement is now as dead as a doornail."
    
    
• as different as chalk and cheese
  • Two people who are as different as chalk and cheese are completely different from each other.
    "I'm surprised they get on so well. They're as different as chalk and cheese."
    
    
• as different as night and day
  • Two people or things that are very different from each other are as different as night and day.
    "Although they are twins they are as different as night and day."
    
    
• as dry as dust
  • Something that is as dry as dust is very dry indeed.
    This expression can also refer to something dull and uninteresting.
    "The ground was as dry as dust. / His speech was as dry as dust."
    
    
• as dull as ditchwater
  • Something as dull as ditchwater is very boring.
    "The film was as dull as ditchwater. I nearly fell asleep."
    
    
• as easy as pie
  • Something that is (as) easy as pie is very easy to do.
    "How did the English test go?" "No problem. It was (as) easy as pie!"
    
    
• as fit as a fiddle
  • A person who is as fit as a fiddle is in an excellent state of health or physical condition.
    "My grandfather is nearly ninety but he's as fit as a fiddle. "