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first thing

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first thing (in the morning)

before anything else is done in the morning. Please call me first thing in the morning. I can't help you now. I'll do that first thing.

See also: first, thing

(the) first thing (in the morning)

before doing anything else The first thing tomorrow, you'll have to cancel our reservations. White had a habit of playing his trumpet first thing in the morning, which really irritated his neighbors.

See also: first, thing

first thing

Before anything else; without delay. For example, Tom was supposed to call him first thing in the morning. [Late 1500s] Also see under first and foremost; first off.

See also: first, thing

first thing

Informal

Right away; before anything else: Do your assignments first thing in the morning.

See also: first, thing