1. Working against computer viruses, typically by detecting and deleting them before they can do any harm

Encyclopedia: Antivirus

• unyieldingness
• unyoke
• unzip
• up
• up and down
• up for
• up for grabs
• up here
• up in arms
• up in the air
• up quark
• up the creek
• up the stairs
• up to
• up to her neck
• up to his neck
• up to my neck
• up to now
• up to our necks
• up to par
• up to scratch
• up to snuff
• up to their necks
• up to your neck
• up-and-coming