(B1) to be doing something
What are you up to at the moment? Bạn đang làm gì đấy?
to do everything you can to achieve a good result, especially when looking for something:
He left no stone unturned in his search for his natural mother.
I'll leave no stone unturned until I find out the reason.
used if something someone says is precisely correct = Nói trúng tim đen, đánh đúng trọng tâm, nói đúng, đoán đúng
Ex. You hit the nail on the head when you said that your wife is jealous of your secretary. Mày nói đúng tim đen khi nói rằng vợ mày ghen với cô thư ký riêng.
chính xác thời gian đó = exactly at the stated time
I'll meet you at 9 o'clock sharp. If you're late, we'll be in trouble. Tôi sẽ gặp bạn đúng 9 giờ. Trễ là có chuyện đó!
The performance will start at 7.30 sharp.
informal, spoken
remain cheerful in difficult circumstances = dũng cảm và tiếp tục; used to tell someone to make an effort to stay brave and confident when they are in a difficult situation.
"Keep your chin up, we're not lost yet!" Hãy dũng cảm và tiếp tục, chúng ta vẫn chưa mất hết!"
Chin up! It'll be over soon.
Keep your chin up! We'll get through this together!