CB - What is a CB in football?

CB has 2 meanings. The most common is "Cornerback." See examples of how people use the terms.
In football, a CB is a cornerback, which is a defensive back (DB) that typically guards a wide receiver. The CB's primary job is to defend receivers, which are typically wide receivers (WR), tight ends (TE), and running backs (RBs).

Ohio State Buckeyes Land Commitment From No. 1 CB Bryce West - Sports Illustrated Ohio State Buckeyes News, Analysis and More

Brice Pollock - Football - Mississippi State

Next Gen Stats' top 10 coverage players of 2021: Cowboys CB on the board but it's not Trevon Diggs

Purdue football recruiting: Franklin Central CB Hudauri Hines commits

Patriots CB Christian Gonzalez has Cowboys' attention with early standout play

Browns waive CB A.J. Green III after claiming Kahlef Hailassie off of waivers

Why did Bengals make deferred claim for former Chiefs CB Chris Lammons?

FIFA 20 best young defenders: The top 50 DEFs on career mode

Father of NFL CB Caleb Farley killed in home explosion

6 WR/CB Matchups to Know: Week 4 (2023 Fantasy Football)

Maryland CB Tarheeb Still: Terps 'Can Handle Whatever Is Thrown Our Way' - PressBox

Harry Maguire is still Englands BEST CB” & Tuchel Sacking a “disgrace” - The Ringer

Texas CB X'Avion Brice enters the NCAA transfer portal - Burnt Orange Nation

Penn State CB Joey Porter Jr. declares for the NFL draft, will not play in bowl game

Jets CB Sauce Gardner's Eye on First Pick of the Season vs. Chargers