Verb dash off has 2 senses
  1. dash off, knock off, toss off, fling off - write quickly; "She dashed off a note to her husdband saying she would not be home for supper"
    --1 is one way to write, compose, pen, indite
    Sample sentence:
    Did he dash off his major works over a short period of time?
  2. dash down, dash off - write down hastily; "She dashed off a letter to her lawyer"
    --2 is one way to write down, set down, get down, put down
    Sample sentence:
    Somebody ----s somebody
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