noun
a shortened form of 'unsubscribe', typically used in the context of opting out of email or mailing lists
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The user decided to unsubscribe from the newsletter by clicking the 'unsub' button.
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I'm so tired of these emails, I'm just gonna hit 'unsub'.
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I'm gonna unsub from this nonsense, it's too much.
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She felt like hitting the 'unsub' button on all the negativity in her life.