What does flexwork mean?
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Flexwork or flexworking refers to flexible working in terms of working hours, location and working model.
If you didn't get anywhere in the pay talk, just keep at it. Explain why you are unhappy with the outcome and ask for another meeting in the near future.
Try to find out why the negotiation failed and prepare for the second round. If this does not lead to success either, the signs may point to departure: start looking for a new job.