1.a storm is brewing
例句： She decided to go ahead with their wedding, even though all they’ve been doing lately is arguing. I can sense a storm is brewing.
2. calm before the storm
例句： The strange quietness in town made her feel peaceful. Little did she know, it was just the calm before the storm.
3. weather a storm
例句： Last year, they had some financial difficulties when her husband was fired. Together, they weathered the storm and figured out how to keep going.
4. when it rains, it pours
例句：First he was made redundant, then his wife got into a car accident. When it rains, it pours.
5. chasing rainbows
例句： His paintings have neither style nor imagination, but he insists on being a professional painter. He’s always chasing rainbows.
6. rain or shine
例句：I’ll see you at the airport, rain or shine.
7. under the sun
例句： Gili Trawangan must be one of the most beautiful islands under the sun.
8. once in a blue moon
例句： He used to call his grandma once in a blue moon. Now that she has passed away, he regrets not making more of an effort to keep in touch.
9. every cloud has a silver lining
例句： Don’t worry about losing your job. It will be okay. Every cloud has a silver lining!
10. a rising tide lifts all boats
例句： When the economy showed the first signs of recovering, everyone started investing and spending more. A rising tide lifts all boats.
11. get into deep water
例句： He got into deep water when he borrowed a lot of money from a loan shark.
12. pour oil on troubled waters
例句： She hated seeing her two best friends arguing, so she got them together and poured oil on troubled waters.
13. make waves
例句：She likes to make waves with her creative marketing campaigns. They get a lot of attention from customers.
14. go with the flow
例句： Quite often in life, good things happen when you don’t make plans. Just go with the flow and see what happens!
15. lost at sea
例句： I am lost at sea with this new system at work. I just can’t understand it.
16. sail close to the wind
例句： They fired their accountant because he sailed too close to the wind.
17. make a mountain out of a molehill
例句： She shouted at him angrily for being five minutes late, but it really didn’t matter that much. She really made a mountain out of a molehill.
18. gain ground
例句： As Airbnb gains ground in many cities all over the world, many locals complain that they can no longer find a place to live. Landlords would rather rent their places out to tourists and earn more money.
19. walking on air
例句： She’s been walking on air since she found out that she’s pregnant.
20. many moons ago
例句：Many moons ago, we used to be two very close friends. Now we’ve gone separate ways and lost contact.