Definition of milling in US English:

milling

adjective

  • 1(of a machine) designed to cut or shape metal using a rotating tool.

    ‘I had to take it home and drill it out on the milling machine’
  • 2(of people or animals) moving around in a confused mass.

    ‘the milling crowds of guests’

Pronunciation

milling

/ˈmiliNG//ˈmɪlɪŋ/