As cold as iceThis idiom can be used to describe a person who does not show any emotion.
As mad as a hatterThis simile means that someone is crazy or behaves very strangely. In the past many people who made hats went insane because they had a lot of contact with mercury.
Average JoeAn average Joe is an ordinary person without anything exceptional about them.
Bald as a cootA person who is completely bald is as bald as a coot.
Barefaced liarA barefaced liar is one who displays no shame about lying even if they are exposed.
Bark is worse than their biteSomeone who's bark is worse than their bite may well get angry and shout, but doesn't take action.
Barrel of laughsIf someone's a barrel of laughs, they are always joking and you find them funny.
Bold as brassSomeone who is as bold as brass is very confident and not worried about how other people will respond or about being caught.
Class actSomeone who's a class act is exceptional in what they do.
Cry-babyA cry-baby is a person who gets emotional and cries too easily.
Daft as a brush(UK) Someone who is daft as a brush is rather stupid.
Dumb as a rockIf you are dumb as a rock, you have no common sense and are stupid.
Fit of piqueIf someone reacts badly because their pride is hurt, this is a fit of pique.
Hail-fellow-well-metSomeone whose behavior is hearty, friendly and congenial.
Hard as nailsA person who is as hard as nails is either physically tough or has little or no respect for other people's feelings.
High-handedIf someone is high-handed, they behave arrogantly and pompously.
I may be daft, but I'm not stupidI might do or say silly things occasionally, but in this instance I know what I am doing (Usually used when someone questions your application of common-sense).
In rude health(UK) If someone's in rude health, they are very healthy and look it.
Johnny-come-latelyA Johnny-come-lately is someone who has recently joined something or arrived somewhere, especially when they want to make changes that are not welcome.
Just off the boatIf someone is just off the boat, they are naive and inexperienced.
Keep up with the JonesesPeople who try to keep up with the Joneses are competitive about material possessions and always try to have the latest and best things.
Laughing stockIf someone becomes a laughing stock they do something so stupid or wrong that no one can take them seriously and people scorn and laugh at them.
Moral fibreMoral fibre is the inner strength to do what you believe to be right in difficult situations Example: He lacked the moral fibre to be leader (In American English the correct spelling is 'fiber'.)
Off your chump(UK) If someone is off their chump, they are crazy or irrational.
Out of your mindIf someone is out of the mind, they are so emotional about something that they are no longer rational.
Plain JaneA plain Jane is a woman who isn't particularly attractive.
Pleased as punchWhen someone is pleased as punch, they are very satisfied about something
Rest on your laurelsIf someone rests on their laurels, they rely on their past achievements, rather than trying to achieve things now.
Sharp as a tack(USA) If someone is as sharp as a tack, they are very clever indeed.
To have the courage of your convictionsIf you have the courage of your convictions, you are brave enough to do what you feel is right, despite any pressure for you to do something different.
Two-facedSomeone who is two-faced will say one thing to your face and another when you're not there.
Yes-manSomeone who always agrees with people in authority is a yes-man.

Will be continued...do keep track.

The next list of idioms will be on PROFESSION/WORK
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