first off

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first off (not comparable)

1. (sequence, idiomatic) Firstly; before anything else. Often used to introduce the first in a list of points to be made in conversation.

• first, firstly, first of all, first up; see all Thesaurus:firstly

• “first off”, in Merriam-Webster Online Dictionary, Springfield, Mass.: Merriam-Webster, 1996–present.
• “first off”, in Collins English Dictionary.
• “first off” in Longman Dictionary of Contemporary English, Longman.