noun
irregular work hours; shift work
Refers to work schedules that deviate from a standard fixed pattern, including rotating shifts, split shifts, or non-standard hours.
この工場では変則勤務を導入している。
This factory has introduced irregular work shifts.
変則勤務のため、生活リズムが不規則になりがちだ。
Because of the irregular work hours, my daily rhythm tends to become irregular.
Compound of 変則 (irregular, anomalous) and 勤務 (work, duty). The exact historical derivation is uncertain, but the term is a straightforward modern compound.