Flank

On the T side, a flank usually means one player, often the lurker, sneaks around the map while the team attacks elsewhere. When CTs rotate to help a bombsite, the lurker catches them from behind.
On the CT side, a flank means a defender moving through another route to hit the Ts from behind during an attack or after a plant. This is common during a retake.
Watching the flank: players often call "watch flank" to remind a teammate to look behind, so the team is not caught by surprise. Teams sometimes leave one player near the flank route during a default just for this.
A good flank needs timing: arrive too early and you fight alone, arrive too late and the round is already decided.
Learn more in CT Side vs T Side.
Related guides
CT Side vs T Side: How Sides and Halftime Work in CS2In CS2, Terrorists attack and Counter-Terrorists defend. How each side wins a round, when teams switch at halftime and which maps favor CT or T side.
LurkTo lurk in CS2 is to play alone, away from your team, usually on the T side, to catch rotating defenders or hold a flank.
RotateTo rotate in CS2 is to move from one bombsite to another, usually on the CT side, after reading where the Ts are going.
DefaultA default in CS2 is the standard T side setup: players spread across the map to gather information before choosing where to attack.
Reviewed by the R1GG team