You can say it stands to reason that something should be so if it seems reasonable to you that it should be so.
You can say something is a shot in the arm if it gives a person or an organisation renewed energy or enthusiasm.
If something or someone is a sight for sore eyes, you are glad to see them.
If you have a skeleton in the cupboard, or in the closet, you have a secret in your past which could damage you if it became known.
If someone gives you a slap on the wrist, they give you a mild punishment for making a mistake or doing something wrong.
If you make a slip of the tongue, you make a small mistake when speaking.
If you are safe and sound, nothing has harmed you even though you could have been in danger.
If you save the day, you do something to ensure success or to solve a serious problem.
If you see eye to eye with someone, you totally agree with them about something.
If you see red, you become extremely angry.
If someone sees things through rose-coloured glasses, they see things as being better than they really are.
If you say "it serves you right", you're telling someone that their problem is the result of their own bad behaviour, and they deserve it.
If you set the world on fire, you do something that creates a lot of excitment and makes you famous.
If you set your sights on something, or set your sights on doing something, it becomes the target of your ambition or the object of your attention.
If you settle a score with someone who has hurt you or insulted you in the past, you do something to hurt or insult them in return.
If you shoot youself in the foot, you harm yourself in some way by doing something stupid or making a silly mistake.
You show your true colours if you show what you're really like, or you reveal your true character.
If you're as sick as a dog, you're very sick.
If you're skating on thin ice, you're doing something risky, or you're in a situation that could quickly become dangerous.
If you are snowed under you have so much to do that you're having trouble doing it all.
You can say "so far, so good" when you're in the middle of doing something, and everything has been going well.
If you speak your mind, you say what you really feel about something, or what you really think.
If you start from scratch, you begin something from the very beginning without using anything else as a starting point.
If something is state-of-the-art, it's the latest and best example of something, or it shows the most recent developments in its field.
If you steer clear of something, you don't go near it because it could harm you or cause you a problem.
If someone sticks out like a sore thumb, or stands out like a sore thumb, everyone notices them because they're not the same as the people around them.
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