dash off

verb

1. To leave a place quickly or briefly.

   “I have to dash off to the store, but I'll be back soon.”

2. To write quickly or informally.

   “Let me dash off a quick note.”

   “In the '50s, she worked as an usherette at the famed Apollo Theater, joined a jazzy trio called the Halos, recorded as the "Dee" half of a short-lived Shirley & Lee-ish Jay & Dee, and dashed off tunes in her spare time.”