expression
just after a holiday break; the first day back after a holiday
Refers to the period or day immediately following a holiday or vacation, often used in contexts like returning to work or school.
休み明けはいつも仕事がたまっている。
Work always piles up right after a holiday.
休み明けの月曜日は特にだるい。
The Monday after a break feels especially sluggish.