WordWeb Online

1. Write quickly
   "She dashed off a note to her husband saying she would not be home for supper";
   - scratch off, knock off [informal], toss off [informal], fling off
    
2. Write down hastily
   "She dashed off a letter to her lawyer";
   - dash down

Derived forms: dashes off, dashed off, dashing off

Type of: compose, get down, indite [archaic], pen, put down, set down, write, write down