Noun

1. The middle of the week.
   • 1987, Graham Marsden, Advanced coarse fishing

     In midweek, however, the stretch is reasonably quiet and I can conceal myself behind a clump of rushes and cast a big piece of luncheon meat on a link-leger rig right in the deep hole and let the current roll it under the roof.

   • 1991, Rugby World and Post,

     Peter Dods was captain in the midweek games but, like Sole, the Gala fullback has also hung up his boots.

Adverb

1. In the middle of the week.
   • 1989, The Independent

     Leicester could only manage a goalless draw midweek with Sutton Coldfield and will be keen to return to winning form.