There are many important factors involved in scoring band 7+ in IELTS speaking, but adding a few idioms into your speaking will certainly help to improve your lexical resource score and is one of the requirements for 7+ in this section. The key factor is to make the idioms sound natural which can be achieved with frequent practice and it would be ideal if a teacher or native speaker listened to you using them. 
The photo at the top of this page is an example of an idiom and it can be used in several situations. Anything that you find easy could be described as a piece of cake. For more IELTS idioms like this I’d advise following my Instagram page.
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A Useful List of Idioms for IELTS

  1. Over the moon-to be very happy

  2. Once in a blue moon-happens very rarely

  3. A piece of cake-very easy

  4. A drop in the ocean-a very small part of something much bigger

  5. Actions speak louder than words-what you do is more important than what you say

  6. Back to the drawing board/back to square one-after a failure starting again

  7. Put all your eggs in one basket-put all your effort or money into something

  8. Off the top of my head-saying something without thinking first

  9. Run of the mill-average or ordinary

  10. Soulmate-person who you were meant to be with 

  11. Down in the dumps-sad

  12. Found my feet-to become comfortable doing something

  13. Set in their ways-not wanting to change

  14. Go the extra mile-do much more than is required

  15. Miss the boat-miss an opportunity 

  16. Costs an arm and a leg-really expensive

  17. Sit on the fence-to be undecided

  18. A blessing in disguise-something positive that isn’t recognised until later

  19. Every cloud has a silver lining-A positive aspect of a negative situation

  20. Over the top-excessive

  21. Feeling under the weather- feeling unwell

  22.  You can’t judge a book by its cover-Outside appearances don’t reveal what something is really like

  23. Drives me up the wall-make me crazy

  24. On the same page-in agreement

  25. Learn the ropes-to learn how to do a job or activity

  26. By the book-following the rules

  27. Bounce back-to recover from earlier losses

  28. Word of mouth-spoken communication as a way of transmitting information

  29. Lower or raise the bar-to increase or decrease the standards that need to be met in order to qualify for something

  30. Early bird-someone who goes to bed early and wakes up early

  31. Night owl-someone who goes to bed late and wakes up late

Activity to Practice Using these Idioms
Look at the common IELTS part 1 speaking questions about your job, hobbies, hometown and current city. Then, try to place one of the idioms above into your answer
What would you like to do in the future? 
I’d be over the moon if I could work for…


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