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).

Lions waiving recent seventh-round CB pick despite strong end to preseason

CB - What is a CB in football?

Football Cornerback

Freshman CB Woodard contributing early at Montana State – Skyline Sports

Joe Starkey's mailbag: Should Steelers swing last-minute deal for Bears CB Jaylon Johnson?

NFL Suspends New York Jets' Cornerback for Off-Field Incident - Sports Illustrated New York Jets News, Analysis and More

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

Football: TCU CB Mason White enters transfer portal - Frogs O' War

Central Bucks East Football Parents Club

SEC Football: 4 possible destinations for Jackson State CB Travis Hunter

Falcons CB A.J. Terrell cleared from concussion protocol, set to play vs Bucs

Football/Soccer: RB, CB, CB, LB - Compactness and Adaptive Movement (Tactical: Defensive principles, Academy Sessions)

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

Seahawks CB Tre Brown is back. Here's what that means for the team