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Related to first thing: First Thing in the Morning
As an initial act. We need to talk about this shipping issue first thing tomorrow. Eating first thing in the morning just makes me nauseous.
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.
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.
first thingearly in the morning; before anything else.
first ˈthing (tomorrow, in the morning, etc.)at the beginning of the period of time mentioned, before doing anything else: I always like a cup of tea first thing in the morning. ♢ Can you lend me some money? I’ll pay you back first thing tomorrow. OPPOSITE: last thing (at night)
Right away; before anything else: Do your assignments first thing in the morning.