keep an eye onEx: I'll keep an eye on her.
trông chừng
at the drop of a hatEx:: Don't let my mother watch any of those sappy movies - she cries at the drop of a hat.
(làm gì) mà không cần do dự, đắn đo nhiều
once in a blue moonEx: She comes to see me once in a blue moon.
hiếm khi
Be over the moon= walk on the air = be on cloud nineEx: She is walking on the air because she has just passed the final exam with flying colors.
rất vui sướng
like father like sonEx: He takes after his father very much. It is like father like son.
Cha nào con nấy