'randomly-checked' originates from the combination of 'randomly,' derived from 'random,' and 'checked,' the past participle of 'check.'

'randomly' evolved from the Middle English 'randoun,' meaning 'impetuous course,' and 'checked' from the Old French 'eschequier,' meaning 'to inspect or verify.'

Initially, 'randomly' meant 'impetuous or haphazard,' and 'checked' meant 'inspected or verified.' Together, they convey the idea of non-systematic inspection.