Definition of "mither"

mither¹

/ˈmaɪðə(ɹ)/

verb
third-person singular simple present mithers, present participle mithering, simple past and past participle mithered
1. (intransitive, Northern England, especially Manchester) To make an unnecessary fuss, moan, bother.
  Quotations
  The European Commission is pondering how to compel phone companies to come up with a universal plug for their chargers. Apple, which uses its own design for its charger cables, is mithering about the change.
  6 February 2020, “The parable of the plug”, in The Economist
2. (transitive, Northern England, especially Manchester) To pester or irritate someone.
  Quotations
  "Every night after work I'd mither [pester] my dad to take me out into the field and practise. There were definitely times when he didn't want to do it, but he never said no.
  11 June 2019, “Women's World Cup: England v Argentina – Keira Walsh 'inspired' by opponents”, in BBC Sport

mither²

/ˈmɪðə(ɹ)/

noun
plural mithers
1. (Scotland and Northern England) mother