What does "coup de théâtre" mean?
I saw four options for a multiple question on my french exercise book. They are:
A. coup de sifflet
B. coup de grâce
C. coup de foudre
D. coup de théâtre
I only understand the C. In fact, i am very confused about the meaning of "coup", what does it exactly mean? Especially since the right answer of this question is D, what is the meaning of D?
Thank you in advance for your kindly answer!