'begrudgingly-assembled' originates from the combination of 'begrudgingly' and 'assembled'. 'Begrudgingly' comes from 'begrudge', which originates from Middle English 'bigrycen', meaning 'to grumble'. 'Assembled' comes from Old French 'assembler', meaning 'to bring together'.

'begrudgingly' changed from Middle English 'bigrycen' to modern English 'begrudge', and eventually became 'begrudgingly'. 'Assembled' evolved from Old French 'assembler' to modern English 'assemble'.

Initially, 'begrudge' meant 'to grumble', but over time it evolved into its current meaning of 'to give reluctantly'. 'Assemble' has largely retained its original meaning of 'to bring together'.