dash_off
1. [ verb ] (writing) write quickly
Synonyms: toss_off fling_off knock_off
Examples:

"She dashed off a note to her husband saying she would not be home for supper"

Related terms: write writing
2. [ verb ] (writing) write down hastily
Synonyms: dash_down
Examples:

"She dashed off a letter to her lawyer"

Related terms: write_down