i can't explain the meaning of this sentences "no wind in our sail"
This sentences in the song of selena gomez
"This is a modern fairy tale
No happy endings
No wind in our sails
But I can't imagine a life without
Breathless moments"

Question

i can't explain the meaning of this sentences "no wind in our sail" 
This sentences in the song of selena gomez 
"This is a modern fairy tale
No happy endings
No wind in our sails
But I can't imagine a life without
Breathless moments"

Answer

It is a metaphor, meaning there is no "energy" left; no motivation.

Answer

It comes from this idiom: "take the wind out of someone's sails", and it means to make someone feel less determined and motivated about sth. 
https://dictionary.cambridge.org/dictionary/english/take-the-wind-out-of-sb-s-sails

Đừng bỏ lỡ cơ hội học ngoại ngữ ngay tại nhà. Hãy xem danh sách các gia sư ngôn ngữ giàu kinh nghiệm của chúng tôi và đăng ký buổi học đầu tiên ngay hôm nay!