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dash a note off
To quickly write and send a message to one. At the very least, just dash a note off to Aunt Mildred and thank her for the gift.
Farlex Dictionary of Idioms. © 2015 Farlex, Inc, all rights reserved.
dash a note offand dash a letter off
to write a note or letter quickly and send it off. I have to dash this letter off, then I will be with you. I'll dash off a note to her.
McGraw-Hill Dictionary of American Idioms and Phrasal Verbs. © 2002 by The McGraw-Hill Companies, Inc.