Might be better to post the list to make it easier to contribute.
Idioms
1)Achilles' Heel :
A person's weak point. It comes from the Greek legend of Achilles.
2)Any Tom, Dick or Harry:
If something could be done by any Tom, Dick or Harry, it could be done by absolutely anyone. Also can be used with 'and'. f every Tom, Dick and Harry knows about something, then it is common knowledge.
3)Davy Jones' Locker:
Davy Jones' Locker is an idiom for the bottom of the sea: the resting place of drowned sailors. The origins of the name are unclear.
4)Freudian Slip:
If someone makes a Freudian slip, they accidentally use the wrong word, but in doing so reveal what they are really thinking rather than what they think the other person wants to hear. My grandfather once said “I have to urinate” when he meant to say “I have a hearing aid”.
5)Jack-of-all-trades:
A jack-of-all-trades is someone that can do many different jobs. Scott is often called
a Jack-of-all-trades because he has had many different careers.
6)John Doe and Jane Doe:
John and Jane Doe are names given to an unidentified male or female who may be party to legal proceedings, or to an unidentified person in hospital, or dead.
7)Jekyll and Hyde:
Someone who has a Jekyll and Hyde personality has a pleasant and a very unpleasant side to the character.
8)Mickey Mouse:
If something is Mickey Mouse, it is intellectually trivial or not of a very high standard. You could say that a university is Mickey Mouse or that a company is Mickey mouse.
9)Midas Touch:
Midas was a king in Greek mythology. Whatever he touched turned to gold. If s omeone has the 'Midas touch', they are very lucky and whatever they do will be a success.
10)Pandora's Box:
If you open a Pandora's box, something you do causes all sorts of trouble that you hadn't anticipated. In WWI, when the archduke Ferdinand was killed, it opened up Pandora's Box in Europe. According to Greek mythology when Pandora, the first woman on Earth, opened her box, the world of sin and misfortune was released.
11) Peeping Tom:
A peeping Tom is someone who tries to look through other people's windows without being seen in order to spy on people in their homes.
12)For the love of Pete! OR For Pete's Sake :
This is an alterative to saying 'For the love of God!' or 'For God's sake'. Some people find it rude to use the word 'God' in that way. For some, it is considered blasphemy.
13)Keeping up with the Joneses:
This simply means “keeping up with the neighbors,” referring to the suburban competition to best one’s neighbors as far as material possessions and social status go.
14)Cup of Joe:
This is a way of saying “A cup of coffee”.
15)Average Joe:
This is the average man in the general public. We also say “John Q. Public”.
16)Rob Peter to pay Paul:
If you rob Peter to pay Paul, you try to solve one problem, but create another in doing so, often through short-term planning.