1 day 1 idiom

Get out of the wrong side of the bed
Meaning to be in a bad mood, it is considered unlucky to put your left foot on the floor first when getting out of bed.
Source: http://www.idiomsite.com/

All Thumbs = clumbsy ... ​

Someone who is very awkward and clumbsy is all thumbs. Example: Hey! You are pouring my coffee on the table!" Reply: "Oh, I''m so sorry! I have been all thumbs today."
The hand works best when four fingers work together with one thumb; if you had all thumbs (and no fingers) it would be awkward for you to hold things or pick things up. Example: "Oh, darn! I broke a glass. I really am all thumbs today."
Some people are clumbsy with their hands in general: they are all thumbs. But most people just have certain days when they are distracted and so are all thumbs for a period of time. Example: "Ouch! You cut my ear." Reply: "I''m so sorry. I have been all thumbs all day."

Lost His Head = he got so upset that he lost control of his actions ... ​

You lose your head when you get upset and lose control of your actions. Example: "I got so angry yesterday. I completely lost my head." Example: "I''m really sorry about what I did. I lost my head."
You are overcome by emotions (especially anger) and lose control of your actions when you lose your head. Example: "Okay, I''ll tell you what happened. But first promise that you won''t lose your head."
A person who loses his head is not in control of his actions because is not thinking clearly. Example: "He lost his head, so they threw him out of the game."

as quiet as a mouse : making almost no noise, being shy and not talking much.
He was shy and as quiet as a mouse.

In(s) And Out(s) = the knowledge gained from experience ... ​

In and out is the way you know something when you know it very well. Example: "I''ve been in this business for 30 years. I know it in and out." Example: "I know this city in and out."
When you add the s and say the ins and outs, you are talking about the special ways that you know to do something, when you know it very well. Example: "I hope you can help me. I want to learn the ins and outs."
Grammar point: In and out acts like an adverb ("I know this in and out"). The ins and outs acts like a noun ("Teach me the ins and outs"). Example: "My friend Jeff has worked in publishing for 15 years. He knows all the ins and outs."

Keep An Eye On s.o / s.th = watch s.o / s.th carefully ...​

To "keep an eye on" someone is to watch that person carefully. Example: "Would you keep an eye on my son for me while I am gone?" Reply: "Sure." You take a share of responsibility for something when you agree to keep an eye on it. Example: "I have to run to the bathroom. Can you keep an eye on my suitcase while I am away?" Reply: "No problem." "Keeping an eye on" someone can also mean watching to make sure that person does not make a mistake. Example: "Be careful what you do today. I''ll be keeping an eye on you."

Not A Chance = it will definitely not happen ...
The "chance" of something happening is the measure of its possibility. To say "not a chance" is to say that something will not happen. Example: "Do you think you will be able to finish your report by five o''clock today?" Answer: "Not a chance. I''ll be busy in meetings all day." "Not a chance" is a strong way of saying "no"; it can be used as a simple response.

Tie The Knot ( get married ... )​

When two people get married, they "tie the knot." Example: "After dating for five years, we finally decided to tie the knot." When you tie "a" knot you wrap two pieces of rope around each other in a certain way so that they will not come apart. When you tie "the" knot you make a promise that you will stay together with one person whom you love. Example: "Did you hear about Dan and Jenny? They finally decided to tie the knot." Two people are like two ropes and they get married to tie "the knot" which keeps them together. Example: "So, when are you two going to tie the knot?"

On Top Of The World = you are feeling great ... ​

When you are "on top of the world" you are feeling great. Example: "What a beautiful day, today. I am on top of the world!" Sometimes you are "on top of the world" because a great thing happened to you; other times it is just because you are feeling great. Example: "What a great time we had that night; we were on top of the world!" If you climbed the highest mountain and looked out to see a beautiful view, you would feel great and be on top of the world.

Under The Gun = under a lot of pressure to get something done ...​

You are under the gun when you are working under tremendous pressure. Example: "Everyone at the office has been under the gun since this new manager arrived."
You are forced to work extra hard when you are under the gun. Example: "We are under the gun to get this project finished at work."
Working under the gun is working hard under pressure to meet deadlines. Example: "I feel I work harder when I am under pressure." Reply: "Me too. I get much more done when I am under the gun