There are 2 main definitions of unsub in English:

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unsub 1

Pronunciation: /ˈənˌsəb/

verb (unsubs, unsubbing, unsubbed)

[no object] informal
Unsubscribe: a month will cost you just $25 and it’s easy to unsub if you decide it isn’t for you
More example sentences
  • To avoid this problem, unsub using your old address, then resubscribe with your new email address.
  • It'd be fascinating to stop keeping up with all this: not update my sites, unsub from mailing lists, keep away from the web.
  • Yes, you should not have to unsub from something you didn't ask to get in the first place - but here again we have no choice.

Origin

1990s: abbreviation.

For editors and proofreaders

Syllabification: un·sub

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There are 2 main definitions of unsub in English:

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unsub 2

Pronunciation: /ˈənˌsəb/

noun

US informal
(In police use) a person of unknown identity who is the subject of a criminal investigation: putting together these insights will help police come up with a composite picture of the unsub
More example sentences
  • I can't tell you how many thousands and thousands of man-hours went into pursuing every lead that came in on unsub number two.
  • The FBI in its investigation concluded that “the bloody palm print located on the passenger door would have to have been left by the unsub.”
  • One of the things we began saying in some of our profiles was that the unsub—the unknown subject—would drive a policelike vehicle.

Origin

1970s: abbreviation of unknown subject or unidentified subject.

For editors and proofreaders

Syllabification: un·sub

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