bereavement leave; condolence leave
Leave taken from work or school due to the death of a close relative; often a set number of days.
I took bereavement leave because my grandfather passed away.
忌引き is the core term for bereavement absence; 忌引き休暇 explicitly adds 休暇 (leave/holiday) to emphasize the formal leave from work or school.
忌中 refers to the mourning period itself (typically 49 days after death), while 忌引き休暇 is the leave taken during that period.
Standard spelling; 忌引き is the common way to write きびき.
Alternate spelling using 忌引 instead of 忌引き; both are seen.
Compound of 忌引き (きびき, 'bereavement absence') and 休暇 (きゅうか, 'leave, holiday'). 忌引き itself derives from 忌 (き, 'mourning') + 引き (ひき, 'pulling, drawing'), referring to the period of withdrawal from normal activities.