Idiomatic expressions are an essential part of learning English and achieving fluency. They are also integral in the understanding of native speakers (HERE). Though idioms and expressions are usually believed to be quite informal, there are some that can be used in semi-formal texts.
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Actions speak louder than words
What you do counts for more than what you say.
It is all well and good talking about it, but actions speak louder than words, so you will nee to demonstrate what you can do.
Best thing since sliced bread
I really love my new car, it´s the best thing since sliced bread
Don´t put all your eggs in one basket
Do not count on only one option; you need multiple things to achieve something
If you really want to be successful, you shouldn´t put all your eggs in one basket
Every cloud has a silver lining
Even bad things or things that seem to be bad can have a good outcome
Though the situation may seem ban now, it is important to remember that every cloud has a silver lining
Give the benefit of the doubt
When you are not sure about something, believe the person without the need for evidence
I´m not sure that is quite right, but I will give you the benefit of the doubt
Hit the nail on the head
Be correct about something
I think that was an excellent idea and I couldn´t agree more, you have hit the nail on the head
Method in your madness
Although the approach or way of doing something is strange, it will be effective
The way he finds the answer to the equations is strange, but there is method in this madness
Once in a blue moon
To occur very rarely
I only see my twin brother once in a blue moon
Pictures paint a thousand words
An image can be more informative than words alone
I don´t understand what you mean, show me as you know that pictures paint a thousand words
Take with a pinch of salt
Not take everything you hear too seriously, not believe everything you hear
He was angry yesterday and didn´t mean what he said, I would take it with a pinch of salt
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The way you use idioms is important. It is clear that they are used in common speech and colloquial contexts, but you need to be careful with their includion in the writing of essays, reports, proposals and formal letters. The idioms included in this post can, however, be used in these types of texts.