تَظُنُّ أَن يُفْعَلَ بِهَا فَاقِرَةٌ 
  Ta  th  unnu an yufAAala bih a  f a qira tun      knowing that a crushing calamity is about to befall them.
   - Mohammad Asad
     
thinking that some backbreaking calamity is about to be inflicted    on them.
   - Muhammad Farooq-i-Azam Malik
   anticipating something devastating to befall them.
   - Mustafa Khattab
     
Thou wilt know that some great disaster is about to fall on them.
   - Marmaduke Pickthall
   In the thought that some back-breaking calamity was about to be    inflicted on them;
   - Abdullah Yusuf Ali