first thing

idiom

Definition of first thing

: before anything else : right away : very early I'll be back first thing (on) Monday morning. She promised to call first thing in the morning.

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Cite this Entry

“First thing.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/first%20thing. Accessed 28 Nov. 2020.

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