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Noun: unsub
Usage: US, informal
  1. (law enforcement) an unknown subject of investigation
    "The detectives worked tirelessly to identify the unsub in the serial robbery case"
Verb: unsub (unsubbed,unsubbing)
Usage: informal
  1. To stop receiving something regularly
    "see below to unsub to the web site's news list";
    - unsubscribe

Derived forms: unsubbed, unsubbing, unsubs

Encyclopedia: Unsub