From the start, immediately. For example, He said to wash the car first off, or Why wasn't she told first off? [Colloquial; late 1800s] Also see under first and foremost; first thing.
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Question 1 of 10
Words nearby first off
The American Heritage® Idioms Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.