25 useful idioms to help you score Band 7.0+ for the IELTS Speaking Test

1. up-market – Relatively expensive and designed to appeal to wealthy consumers: khá đắt và được thiết kế để hấp dẫn khách hàng sang trọng.
   an up-market restaurant that is quite pricey but also quite good.
   một nhà hàng khá đắt đỏ hấp dẫn khách hạng sang thì khá đắt tiền nhưng mà cũng khá ngon.
2. cram – to try to accomplish a lot quickly, also can mean to try to put a lot of items in a tight fit, which is probably not idiomatic with that meaning: cố gắng để đạt được nhiều và nhanh, cũng có thể hiểu là cố gắng đặt/nhét nhiều thứ vào một  cái gì đã chật.
   The students are all cramming to get ready for the exams.
   Những sinh viên đang cố gắng nhồi nhét tất cả để sẵn sàng cho kì thi.
3. in high spirits – extremely happy: cực kì vui, hạnh phúc
   They’d had a couple of drinks and were in high spirits.
4. keep one’s chin up – remain brave and keep on trying; remain cheerful in difficult circumstances.
   Keep your chin up. Don’t take your troubles to bed with you.
   Keep your chin up. Things will get better sooner or later.
5. read my/your/his mind – guess what somebody is thinking.
   I was surprised he knew what I was planning, like he could read my mind.
6. get the ball rolling – start doing something, especially something big.
   I decided to set the ball rolling and got up to dance.
   You should get the ball rolling as soon as possible to be well-prepared for the IELTS test.
7. for ages – for a very long time.
   I waited for ages but he never showed up.
8. fill in for someone – do someone’s work while he is away; substitute for
   Bill is going to be filling in for me while I’m out on maternity leave.
9. antsy – getting restless.
   The guys are getting antsy, we need to go somewhere else before they get too noisy. 
10. (as) easy as pie – very easy.
    For Tom, getting a graphic design certificate was easy as pie –he seemed to have a natural talent for it.
11. under the weather – sick; not completely well.
    I noticed that the cat was looking a little under the weather.
12. fingers-crossed = keep one’s fingers crossed (for someone or something) – to wish for luck for someone or something.fingers crossed for your driving test.
    We’re keeping our fingers crossed that he’ll be healthy again very soon.
13. have a chin-wag – have a long conversation between friends; have a chat.
    We had a good chin-wag over a bottle of wine.
14. chicken scratch – the handwriting that is crammed or illegible.
    His signature – an unforgettably idiosyncratic chicken scratch.
15. the wee hours – after midnight.
    He was up until the wee hours trying to finish his work.
16. a blessing in a disguise – something that seems bad or unlucky at first, but results in something good happening later.
    Losing that job was a blessing in disguise really.
17. all in the same boat – in the same difficult situation as someone else.
    None of us has any money, so we’re all in the same boat.
18. beating around the bush – avoid the main topic and not speaking directly about it.
    Let’s stop beating about the bush and discuss this matter.
19. early bird – someone who gets up early.
    I never miss sunrise. I’m an early bird.
20. a breath of fresh air – something that is new & refreshing.
    Selena was a talented and beautiful entertainer, a breath of fresh air in an industry full of people all trying to copy each other.
21. keep an eye on – to monitor a situation, not forget about it.
    Keep an eye on the noodles, there almost done.
22. keep your nose to the grindstone – continue to put forward a good effort.
    If you keep your nose to the grindstone, you will finish this job tonight.
23. know something [it, this] inside out – to be totally familiar with.
    He knows that subject backwards and forwards.
24. leave well enough alone – to not try to change something that is good enough.
    This repair is not perfect, but let’s leave well enough alone.
25. now and then – on an occasional basis, often every is used as the first word of this idiomatic phrase.
    Every now and then I have a good idea.

Source: 25 Common Idioms In IELTS Speaking (Part 3/5)