Definition: First thing in the morning - with Gymglish, online personalized daily English lessons for all levels. Free test.
Synonyms for 'first thing (in the morning)': in the morning, bright and early, at the crack of dawn, light, lunchtime, before dark, by night/day.
From Longman Dictionary of Contemporary Englishfirst thingfirst thingEARLYas soon as you get up in the morning, or as soon as you start work I'll call you first.
I think of 'first thing in the morning' as referring to when I get up. Or having to meet with people, when they first get up. It could also refer to the.