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Verb: iconise  'I-ku,nIz
Usage: Brit (N. Amer: iconize)
  1. (computing) reduce a window or program to a small icon that can be clicked on to reopen it
    "When you're done with a program but might need it later, you can iconise it to free up screen space";
    - iconify, iconize

Derived forms: iconised, iconises, iconising