The story
From the noun leave (“permission to be absent”) + -ism, coined in 2013 by Dr Ian Hesketh when researching wellbeing of UK police workers.
Etymology from Wiktionary, CC BY-SA 4.0.
leaveism
Today it means: The practice of employees using flexitime and other leave entitlement schemes to take time off when they are in fact too unwell to go to work. Full definition →