The verb 'skive' is mostly used in the UK, and might not be understood elsewhere. She didn't know what 'skive' meant until she studied English in London.
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Negative Connotation
'Skive' often implies laziness or irresponsibility when used to describe avoiding work. His boss was angry to discover he'd been skiving off meetings.
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Informal Context
Use 'skive' in casual conversations; it's not formal and may seem out of place in official documentation. We might skive off and hit the beach instead of going to class.